diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
index edd187dd..0faea606 100644
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@@ -1,3 +1,4 @@
 # These are supported funding model platforms
 
-patreon: pyexcel
+github: chfw
+patreon: chfw
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
new file mode 100644
index 00000000..6017f21e
--- /dev/null
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -0,0 +1,9 @@
+With your PR, here is a check list:
+
+- [ ] Has test cases written?
+- [ ] Has all code lines tested?
+- [ ] Has `make format` been run?
+- [ ] Please update CHANGELOG.yml(not CHANGELOG.rst)
+- [ ] Passes all Travis CI builds
+- [ ] Has fair amount of documentation if your change is complex
+- [ ] Agree on NEW BSD License for your contribution
diff --git a/.github/workflows/moban-update.yml b/.github/workflows/moban-update.yml
new file mode 100644
index 00000000..706fd825
--- /dev/null
+++ b/.github/workflows/moban-update.yml
@@ -0,0 +1,29 @@
+on: [push]
+
+jobs:
+  run_moban:
+    runs-on: ubuntu-latest
+    name: synchronize templates via moban
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          ref: ${{ github.head_ref }}
+      - name: Set up Python
+        uses: actions/setup-python@v1
+        with:
+          python-version: '3.7'
+      - name: check changes
+        run: |
+          pip install moban gitfs2 pypifs moban-jinja2-github moban-ansible
+          moban
+          git status
+          git diff --exit-code
+      - name: Auto-commit
+        if: failure()
+        uses: docker://cdssnc/auto-commit-github-action
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          args: >-
+            This is an auto-commit, updating project meta data,
+            such as changelog.rst, contributors.rst
diff --git a/.github/workflows/pythonpublish.yml b/.github/workflows/pythonpublish.yml
new file mode 100644
index 00000000..9e7ec429
--- /dev/null
+++ b/.github/workflows/pythonpublish.yml
@@ -0,0 +1,26 @@
+name: Upload Python Package
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: Set up Python
+        uses: actions/setup-python@v1
+        with:
+          python-version: '3.x'
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install setuptools wheel twine
+      - name: Build and publish
+        env:
+          TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
+          TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
+        run: |
+          python setup.py sdist bdist_wheel
+          twine upload dist/*
diff --git a/.gitignore b/.gitignore
index 1468b55d..67a06323 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,7 +25,6 @@ parts/
 sdist/
 var/
 wheels/
-pip-wheel-metadata/
 share/python-wheels/
 *.egg-info/
 .installed.cfg
@@ -52,8 +51,10 @@ htmlcov/
 nosetests.xml
 coverage.xml
 *.cover
+*.py,cover
 .hypothesis/
 .pytest_cache/
+cover/
 
 # Translations
 *.mo
@@ -63,6 +64,7 @@ coverage.xml
 *.log
 local_settings.py
 db.sqlite3
+db.sqlite3-journal
 
 # Flask stuff:
 instance/
@@ -75,6 +77,7 @@ instance/
 docs/_build/
 
 # PyBuilder
+.pybuilder/
 target/
 
 # Jupyter Notebook
@@ -85,17 +88,23 @@ profile_default/
 ipython_config.py
 
 # pyenv
-.python-version
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
 
 # pipenv
 #   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
 #   However, in case of collaboration, if having platform-specific dependencies or dependencies
-#   having no cross-platform support, pipenv may install dependencies that don’t work, or not
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
 #   install all needed dependencies.
 #Pipfile.lock
 
-# celery beat schedule file
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
 celerybeat-schedule
+celerybeat.pid
 
 # SageMath parsed files
 *.sage.py
@@ -127,6 +136,12 @@ dmypy.json
 # Pyre type checker
 .pyre/
 
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
 # VirtualEnv rules
 # Virtualenv
 # http://iamzed.com/2009/05/07/a-primer-on-virtualenv/
@@ -159,6 +174,7 @@ pip-selfcheck.json
 # Windows rules
 # Windows thumbnail cache files
 Thumbs.db
+Thumbs.db:encryptable
 ehthumbs.db
 ehthumbs_vista.db
 
@@ -264,6 +280,7 @@ flycheck_*.el
 # Vim rules
 # Swap
 [._]*.s[a-v][a-z]
+!*.svg  # comment out if you don't need vector files
 [._]*.sw[a-p]
 [._]s[a-rt-v][a-z]
 [._]ss[a-gi-z]
@@ -271,6 +288,7 @@ flycheck_*.el
 
 # Session
 Session.vim
+Sessionx.vim
 
 # Temporary
 .netrwhist
@@ -281,7 +299,7 @@ tags
 [._]*.un~
 
 # JetBrains rules
-# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
 # Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
 
 # User-specific stuff
@@ -311,9 +329,14 @@ tags
 # When using Gradle or Maven with auto-import, you should exclude module files,
 # since they will be recreated, and may cause churn.  Uncomment if using
 # auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
 # .idea/modules.xml
 # .idea/*.iml
 # .idea/modules
+# *.iml
+# *.ipr
 
 # CMake
 cmake-build-*/
@@ -363,6 +386,7 @@ fabric.properties
 
 # SFTP configuration file
 sftp-config.json
+sftp-config-alt*.json
 
 # Package control specific files
 Package Control.last-run
@@ -400,6 +424,10 @@ tmtags
 !.vscode/tasks.json
 !.vscode/launch.json
 !.vscode/extensions.json
+*.code-workspace
+
+# Local History for Visual Studio Code
+.history/
 
 # Xcode rules
 # Xcode
@@ -426,6 +454,9 @@ DerivedData/
 *.perspectivev3
 !default.perspectivev3
 
+## Gcc Patch
+/*.gcno
+
 # Eclipse rules
 .metadata
 bin/
@@ -477,12 +508,17 @@ local.properties
 
 # Annotation Processing
 .apt_generated/
+.apt_generated_test/
 
 # Scala IDE specific (Scala & Java development for Eclipse)
 .cache-main
 .scala_dependencies
 .worksheet
 
+# Uncomment this line if you wish to ignore the project description file.
+# Typically, this file would be tracked if it contains build/dependency configurations:
+#.project
+
 # TortoiseGit rules
 # Project-level settings
 /.tgitconfig
@@ -506,5 +542,8 @@ cscope.in.out
 cscope.po.out
 
 
+# remove moban hash dictionary
+.moban.hashes
+
 docs/build/
 commons
diff --git a/.isort.cfg b/.isort.cfg
new file mode 100644
index 00000000..9de62358
--- /dev/null
+++ b/.isort.cfg
@@ -0,0 +1,10 @@
+[settings]
+line_length=79
+known_first_party=
+known_third_party=mock,nose,pyexcel_io
+indent='    '
+multi_line_output=3
+length_sort=1
+default_section=FIRSTPARTY
+no_lines_before=LOCALFOLDER
+sections=FUTURE,STDLIB,FIRSTPARTY,THIRDPARTY,LOCALFOLDER
diff --git a/.moban.d/README.rst b/.moban.d/README.rst
deleted file mode 100644
index 4c44e071..00000000
--- a/.moban.d/README.rst
+++ /dev/null
@@ -1,160 +0,0 @@
-{%extends "BASIC-README.rst.jj2"%}
-
-{%block features%}
-
-Feature Highlights
-===================
-
-1. One application programming interface(API) to handle multiple data sources:
-
-   * physical file
-   * memory file
-   * SQLAlchemy table
-   * Django Model
-   * Python data structures: dictionary, records and array
-2. One API to read and write data in various excel file formats.
-3. For large data sets, data streaming are supported. A genenerator can be returned to you. Checkout iget_records, iget_array, isave_as and isave_book_as. 
-
-{% endblock %}
-
-{%block usage%}
-
-Usage
-===============
-
-Please note that you will have to use '.sortable.html' in order to replicate the example.
-
-.. image:: https://github.com/pyexcel/pyexcel-sortable/raw/master/sortable.gif
-
-.. code-block:: python
-
-    >>> # pip install pyexcel-text==0.2.7.1
-    >>> import pyexcel as p
-    >>> ccs_insight2 = p.Sheet()
-    >>> ccs_insight2.name = "Worldwide Mobile Phone Shipments (Billions), 2017-2021"
-    >>> ccs_insight2.ndjson = """
-    ... {"year": ["2017", "2018", "2019", "2020", "2021"]}
-    ... {"smart phones": [1.53, 1.64, 1.74, 1.82, 1.90]}
-    ... {"feature phones": [0.46, 0.38, 0.30, 0.23, 0.17]}
-    ... """.strip()
-    >>> ccs_insight2
-    pyexcel sheet:
-    +----------------+------+------+------+------+------+
-    | year           | 2017 | 2018 | 2019 | 2020 | 2021 |
-    +----------------+------+------+------+------+------+
-    | smart phones   | 1.53 | 1.64 | 1.74 | 1.82 | 1.9  |
-    +----------------+------+------+------+------+------+
-    | feature phones | 0.46 | 0.38 | 0.3  | 0.23 | 0.17 |
-    +----------------+------+------+------+------+------+
-
-
-
-Suppose you have the following data in a dictionary:
-
-========= ====
-Name      Age
-========= ====
-Adam      28
-Beatrice  29
-Ceri      30
-Dean      26
-========= ====
-
-you can easily save it into an excel file using the following code:
-
-.. code-block:: python
-
-   >>> import pyexcel
-   >>> # make sure you had pyexcel-xls installed
-   >>> a_list_of_dictionaries = [
-   ...     {
-   ...         "Name": 'Adam',
-   ...         "Age": 28
-   ...     },
-   ...     {
-   ...         "Name": 'Beatrice',
-   ...         "Age": 29
-   ...     },
-   ...     {
-   ...         "Name": 'Ceri',
-   ...         "Age": 30
-   ...     },
-   ...     {
-   ...         "Name": 'Dean',
-   ...         "Age": 26
-   ...     }
-   ... ]
-   >>> pyexcel.save_as(records=a_list_of_dictionaries, dest_file_name="your_file.xls")
-
-
-And here's how to obtain the records:
-
-.. code-block:: python
-   
-   >>> import pyexcel as p
-   >>> records = p.iget_records(file_name="your_file.xls")
-   >>> for record in records:
-   ...     print("%s is aged at %d" % (record['Name'], record['Age']))
-   Adam is aged at 28
-   Beatrice is aged at 29
-   Ceri is aged at 30
-   Dean is aged at 26
-   >>> p.free_resources()
-
-
-Advanced usage :fire:
-----------------------
-
-If you are dealing with big data, please consider these usages:
-
-   >>> def increase_everyones_age(generator):
-   ...     for row in generator:
-   ...         row['Age'] += 1
-   ...         yield row
-   >>> def duplicate_each_record(generator):
-   ...     for row in generator:
-   ...         yield row
-   ...         yield row
-   >>> records = p.iget_records(file_name="your_file.xls")
-   >>> io=p.isave_as(records=duplicate_each_record(increase_everyones_age(records)),
-   ...     dest_file_type='csv', dest_lineterminator='\n')
-   >>> print(io.getvalue())
-   Age,Name
-   29,Adam
-   29,Adam
-   30,Beatrice
-   30,Beatrice
-   31,Ceri
-   31,Ceri
-   27,Dean
-   27,Dean
-   <BLANKLINE>
-
-Two advantages of above method:
-
-#. Add as many wrapping functions as you want.
-#. Constant memory consumption
-
-Available Plugins
-=================
-
-{% include "plugins-list.rst.jj2"%}
-
-
-Acknowledgement
-===============
-
-All great work have been done by odf, ezodf, xlrd, xlwt, tabulate and other
-individual developers. This library unites only the data access code.
-
-
-.. testcode::
-   :hide:
-   
-   >>> import os
-   >>> os.unlink("your_file.xls")
-
-{%endblock%}
-
-{%block development_guide%}
-{%endblock%}
diff --git a/.moban.d/setup.py b/.moban.d/custom_setup.py.jj2
similarity index 79%
rename from .moban.d/setup.py
rename to .moban.d/custom_setup.py.jj2
index 8a8059af..2b9c01a1 100644
--- a/.moban.d/setup.py
+++ b/.moban.d/custom_setup.py.jj2
@@ -12,5 +12,8 @@
 
 {% block additional_classifiers %}
     'Development Status :: 3 - Alpha',
-    'Programming Language :: Python :: Implementation :: PyPy'
 {% endblock %}}
+
+{%- block morefiles %}
+ "CONTRIBUTORS.rst",
+{%- endblock %}
diff --git a/.moban.d/docs/source/bigdata.rst.jj2 b/.moban.d/docs/source/bigdata.rst.jj2
new file mode 100644
index 00000000..fb43ae2b
--- /dev/null
+++ b/.moban.d/docs/source/bigdata.rst.jj2
@@ -0,0 +1,6 @@
+================================================================================
+Read partial data
+================================================================================
+
+
+{% include "partial-data.rst.jj2" %}
\ No newline at end of file
diff --git a/.moban.d/docs/source/custom_conf.py.jj2 b/.moban.d/docs/source/custom_conf.py.jj2
index 00b03072..e3428adf 100644
--- a/.moban.d/docs/source/custom_conf.py.jj2
+++ b/.moban.d/docs/source/custom_conf.py.jj2
@@ -1,3 +1,19 @@
-{% include 'docs/source/conf.py' %}
+{% extends 'docs/source/conf.py.jj2'%}
 
-master_doc = "index"
\ No newline at end of file
+{%block SPHINX_EXTENSIONS%}
+    'sphinx.ext.autosummary',
+    'sphinx.ext.napoleon',
+    'sphinxcontrib.excel'
+{%endblock%}
+
+{%block custom_doc_theme%}
+html_theme = 'default'
+def setup(app):
+    app.add_stylesheet('theme_overrides.css')
+
+
+{%endblock%}
+
+{%block additional_mapping%}
+    'xlrd': ('http://xlrd.readthedocs.io/en/latest/', None)
+{%endblock%}
diff --git a/.moban.d/docs/source/guide.rst b/.moban.d/docs/source/guide.rst.jj2
similarity index 100%
rename from .moban.d/docs/source/guide.rst
rename to .moban.d/docs/source/guide.rst.jj2
diff --git a/.moban.d/docs/source/pyexcel-index.rst.jj2 b/.moban.d/docs/source/pyexcel-index.rst.jj2
index df3dec26..4f83349b 100644
--- a/.moban.d/docs/source/pyexcel-index.rst.jj2
+++ b/.moban.d/docs/source/pyexcel-index.rst.jj2
@@ -23,6 +23,127 @@ Installation
 
 {%include "installation.rst.jj2" %}
 
+Suppose you have the following data in a dictionary:
+
+========= ====
+Name      Age
+========= ====
+Adam      28
+Beatrice  29
+Ceri      30
+Dean      26
+========= ====
+
+you can easily save it into an excel file using the following code:
+
+.. code-block:: python
+
+   >>> import pyexcel
+   >>> # make sure you had pyexcel-xls installed
+   >>> a_list_of_dictionaries = [
+   ...     {
+   ...         "Name": 'Adam',
+   ...         "Age": 28
+   ...     },
+   ...     {
+   ...         "Name": 'Beatrice',
+   ...         "Age": 29
+   ...     },
+   ...     {
+   ...         "Name": 'Ceri',
+   ...         "Age": 30
+   ...     },
+   ...     {
+   ...         "Name": 'Dean',
+   ...         "Age": 26
+   ...     }
+   ... ]
+   >>> pyexcel.save_as(records=a_list_of_dictionaries, dest_file_name="your_file.xls")
+
+And here's how to obtain the records:
+
+.. code-block:: python
+
+   >>> import pyexcel as p
+   >>> records = p.iget_records(file_name="your_file.xls")
+   >>> for record in records:
+   ...     print("%s is aged at %d" % (record['Name'], record['Age']))
+   Adam is aged at 28
+   Beatrice is aged at 29
+   Ceri is aged at 30
+   Dean is aged at 26
+   >>> p.free_resources()
+
+
+Custom data rendering:
+
+.. code-block:: python
+
+    >>> # pip install pyexcel-text==0.2.7.1
+    >>> import pyexcel as p
+    >>> ccs_insight2 = p.Sheet()
+    >>> ccs_insight2.name = "Worldwide Mobile Phone Shipments (Billions), 2017-2021"
+    >>> ccs_insight2.ndjson = """
+    ... {"year": ["2017", "2018", "2019", "2020", "2021"]}
+    ... {"smart phones": [1.53, 1.64, 1.74, 1.82, 1.90]}
+    ... {"feature phones": [0.46, 0.38, 0.30, 0.23, 0.17]}
+    ... """.strip()
+    >>> ccs_insight2
+    pyexcel sheet:
+    +----------------+------+------+------+------+------+
+    | year           | 2017 | 2018 | 2019 | 2020 | 2021 |
+    +----------------+------+------+------+------+------+
+    | smart phones   | 1.53 | 1.64 | 1.74 | 1.82 | 1.9  |
+    +----------------+------+------+------+------+------+
+    | feature phones | 0.46 | 0.38 | 0.3  | 0.23 | 0.17 |
+    +----------------+------+------+------+------+------+
+
+
+Advanced usage :fire:
+----------------------
+
+If you are dealing with big data, please consider these usages:
+
+.. code-block:: python
+
+   >>> def increase_everyones_age(generator):
+   ...     for row in generator:
+   ...         row['Age'] += 1
+   ...         yield row
+   >>> def duplicate_each_record(generator):
+   ...     for row in generator:
+   ...         yield row
+   ...         yield row
+   >>> records = p.iget_records(file_name="your_file.xls")
+   >>> io=p.isave_as(records=duplicate_each_record(increase_everyones_age(records)),
+   ...     dest_file_type='csv', dest_lineterminator='\n')
+   >>> print(io.getvalue())
+   Age,Name
+   29,Adam
+   29,Adam
+   30,Beatrice
+   30,Beatrice
+   31,Ceri
+   31,Ceri
+   27,Dean
+   27,Dean
+   <BLANKLINE>
+
+
+Two advantages of above method:
+
+#. Add as many wrapping functions as you want.
+#. Constant memory consumption
+
+
+.. testcode::
+   :hide:
+
+   >>> import os
+   >>> os.unlink("your_file.xls")
+
+
+
 For individual excel file formats, please install them as you wish:
 
 {%include "plugins-list.rst.jj2"%}
@@ -34,7 +155,9 @@ For compatibility tables of pyexcel-io plugins, please click `here <http://pyexc
     ======== ========== ============= ==================== ============= =============
     pyexcel  pyexcel-io pyexcel-text  pyexcel-handsontable pyexcel-pygal pyexcel-gantt
     ======== ========== ============= ==================== ============= =============
-    0.5.14+  0.5.18+    0.2.6+        0.0.1+               0.0.1         0.0.1
+    0.6.5+   0.6.2+     0.2.6+        0.0.1+               0.0.1         0.0.1
+    0.5.15+  0.5.19+    0.2.6+        0.0.1+               0.0.1         0.0.1
+    0.5.14   0.5.18     0.2.6+        0.0.1+               0.0.1         0.0.1
     0.5.10+  0.5.11+    0.2.6+        0.0.1+               0.0.1         0.0.1
     0.5.9.1+ 0.5.9.1+   0.2.6+        0.0.1                0.0.1         0.0.1
     0.5.4+   0.5.1+     0.2.6+        0.0.1                0.0.1         0.0.1
@@ -141,7 +264,7 @@ Design
    architecture
 
 New tutorial
-----------
+--------------
 .. toctree::
 
    quickstart
@@ -154,7 +277,7 @@ New tutorial
    database
 
 Old tutorial
-----------
+--------------
 .. toctree::
 
    tutorial_file
diff --git a/.moban.d/docs/source/quickstart.rst.jj2 b/.moban.d/docs/source/quickstart.rst.jj2
new file mode 100644
index 00000000..10936172
--- /dev/null
+++ b/.moban.d/docs/source/quickstart.rst.jj2
@@ -0,0 +1,3 @@
+{% set sphinx=True %}
+
+{% include "one-liners.rst.jj2" %}
\ No newline at end of file
diff --git a/.moban.d/docs/source/two-liners.rst.jj2 b/.moban.d/docs/source/two-liners.rst.jj2
new file mode 100644
index 00000000..4f47dc30
--- /dev/null
+++ b/.moban.d/docs/source/two-liners.rst.jj2
@@ -0,0 +1,3 @@
+{% set sphinx=True %}
+
+{% include "two-liners.rst.jj2" %}
\ No newline at end of file
diff --git a/.moban.d/minimum_requirements.txt b/.moban.d/minimum_requirements.txt.jj2
similarity index 100%
rename from .moban.d/minimum_requirements.txt
rename to .moban.d/minimum_requirements.txt.jj2
diff --git a/.moban.d/one-liners.rst.jj2 b/.moban.d/one-liners.rst.jj2
new file mode 100644
index 00000000..e055904d
--- /dev/null
+++ b/.moban.d/one-liners.rst.jj2
@@ -0,0 +1,583 @@
+One liners
+================================================================================
+
+This section shows you how to get data from your excel files and how to
+export data to excel files in **one line**
+
+Read from the excel files
+--------------------------------------------------------------------------------
+
+Get a list of dictionaries
+********************************************************************************
+
+{% if sphinx %}
+.. testcode::
+   :hide:
+
+   >>> import os
+   >>> import pyexcel as p
+   >>> content="""
+   ... Coffees,Serving Size,Caffeine (mg)
+   ... Starbucks Coffee Blonde Roast,venti(20 oz),475
+   ... Dunkin' Donuts Coffee with Turbo Shot,large(20 oz.),398
+   ... Starbucks Coffee Pike Place Roast,grande(16 oz.),310
+   ... Panera Coffee Light Roast,regular(16 oz.),300
+   ... """.strip()
+   >>> sheet = p.get_sheet(file_content=content, file_type='csv')
+   >>> sheet.save_as("your_file.xls")
+
+{% endif %}
+
+Suppose you want to process the following coffee data (data source `coffee chart <https://cspinet.org/eating-healthy/ingredients-of-concern/caffeine-chart>`_ on the center for science in the public interest):
+
+{% if sphinx %}
+
+.. pyexcel-table::
+
+   ---pyexcel:Top 5 coffeine drinks---
+   Coffees,Serving Size,Caffeine (mg)
+   Starbucks Coffee Blonde Roast,venti(20 oz),475
+   Dunkin' Donuts Coffee with Turbo Shot,large(20 oz.),398
+   Starbucks Coffee Pike Place Roast,grande(16 oz.),310
+   Panera Coffee Light Roast,regular(16 oz.),300
+
+{% else %}
+
+Top 5 coffeine drinks:
+
+=====================================  ===============  =============
+Coffees                                Serving Size     Caffeine (mg)
+Starbucks Coffee Blonde Roast          venti(20 oz)     475
+Dunkin' Donuts Coffee with Turbo Shot  large(20 oz.)    398
+Starbucks Coffee Pike Place Roast      grande(16 oz.)   310
+Panera Coffee Light Roast              regular(16 oz.)  300
+=====================================  ===============  =============
+
+{% endif %}
+
+Let's get a list of dictionary out from the xls file:
+
+.. code-block:: python
+
+   >>> records = p.get_records(file_name="your_file.xls")
+
+And let's check what do we have:
+
+.. code-block:: python
+
+   >>> for r in records:
+   ...     print(f"{r['Serving Size']} of {r['Coffees']} has {r['Caffeine (mg)']} mg")
+   venti(20 oz) of Starbucks Coffee Blonde Roast has 475 mg
+   large(20 oz.) of Dunkin' Donuts Coffee with Turbo Shot has 398 mg
+   grande(16 oz.) of Starbucks Coffee Pike Place Roast has 310 mg
+   regular(16 oz.) of Panera Coffee Light Roast has 300 mg
+
+
+Get two dimensional array
+********************************************************************************
+
+Instead, what if you have to use `pyexcel.get_array` to do the same:
+
+.. code-block:: python
+
+   >>> for row in p.get_array(file_name="your_file.xls", start_row=1):
+   ...     print(f"{row[1]} of {row[0]} has {row[2]} mg")
+   venti(20 oz) of Starbucks Coffee Blonde Roast has 475 mg
+   large(20 oz.) of Dunkin' Donuts Coffee with Turbo Shot has 398 mg
+   grande(16 oz.) of Starbucks Coffee Pike Place Roast has 310 mg
+   regular(16 oz.) of Panera Coffee Light Roast has 300 mg
+
+
+where `start_row` skips the header row.
+
+
+Get a dictionary
+********************************************************************************
+
+You can get a dictionary too:
+
+Now let's get a dictionary out from the spreadsheet:
+
+.. code-block:: python
+
+   >>> my_dict = p.get_dict(file_name="your_file.xls", name_columns_by_row=0)
+
+And check what do we have:
+
+.. code-block:: python
+
+   >>> from pyexcel._compact import OrderedDict
+   >>> isinstance(my_dict, OrderedDict)
+   True
+   >>> for key, values in my_dict.items():
+   ...     print(key + " : " + ','.join([str(item) for item in values]))
+   Coffees : Starbucks Coffee Blonde Roast,Dunkin' Donuts Coffee with Turbo Shot,Starbucks Coffee Pike Place Roast,Panera Coffee Light Roast
+   Serving Size : venti(20 oz),large(20 oz.),grande(16 oz.),regular(16 oz.)
+   Caffeine (mg) : 475,398,310,300
+
+Please note that my_dict is an OrderedDict.
+
+Get a dictionary of two dimensional array
+********************************************************************************
+
+{% if sphinx %}
+.. testcode::
+   :hide:
+
+   >>> a_dictionary_of_two_dimensional_arrays = {
+   ...      'Sheet 1':
+   ...          [
+   ...              [1.0, 2.0, 3.0],
+   ...              [4.0, 5.0, 6.0],
+   ...              [7.0, 8.0, 9.0]
+   ...          ],
+   ...      'Sheet 2':
+   ...          [
+   ...              ['X', 'Y', 'Z'],
+   ...              [1.0, 2.0, 3.0],
+   ...              [4.0, 5.0, 6.0]
+   ...          ],
+   ...      'Sheet 3':
+   ...          [
+   ...              ['O', 'P', 'Q'],
+   ...              [3.0, 2.0, 1.0],
+   ...              [4.0, 3.0, 2.0]
+   ...          ]
+   ...  }
+   >>> data = OrderedDict()
+   >>> data.update({"Sheet 1": a_dictionary_of_two_dimensional_arrays['Sheet 1']})
+   >>> data.update({"Sheet 2": a_dictionary_of_two_dimensional_arrays['Sheet 2']})
+   >>> data.update({"Sheet 3": a_dictionary_of_two_dimensional_arrays['Sheet 3']})
+   >>> p.save_book_as(bookdict=data, dest_file_name="book.xls")
+
+{% endif %}
+
+Suppose you have a multiple sheet book as the following:
+
+{% if sphinx %}
+
+.. pyexcel-table::
+
+   ---pyexcel:Sheet 1---
+   1,2,3
+   4,5,6
+   7,8,9
+   ---pyexcel---
+   ---pyexcel:Sheet 2---
+   X,Y,Z
+   1,2,3
+   4,5,6
+   ---pyexcel---
+   ---pyexcel:Sheet 3---
+   O,P,Q
+   3,2,1
+   4,3,2
+
+{% else %}
+
+pyexcel:Sheet 1:
+
+=====================  =  =
+1                      2  3
+4                      5  6
+7                      8  9
+=====================  =  =
+
+pyexcel:Sheet 2:
+
+=====================  =  =
+X                      Y  Z
+1                      2  3
+4                      5  6
+=====================  =  =
+
+pyexcel:Sheet 3:
+
+=====================  =  =
+O                      P  Q
+3                      2  1
+4                      3  2
+=====================  =  =
+
+{% endif %}
+
+Here is the code to obtain those sheets as a single dictionary:
+
+.. code-block:: python
+
+   >>> book_dict = p.get_book_dict(file_name="book.xls")
+
+And check:
+
+.. code-block:: python
+
+   >>> isinstance(book_dict, OrderedDict)
+   True
+   >>> import json
+   >>> for key, item in book_dict.items():
+   ...     print(json.dumps({key: item}))
+   {"Sheet 1": [[1, 2, 3], [4, 5, 6], [7, 8, 9]]}
+   {"Sheet 2": [["X", "Y", "Z"], [1, 2, 3], [4, 5, 6]]}
+   {"Sheet 3": [["O", "P", "Q"], [3, 2, 1], [4, 3, 2]]}
+
+{% if sphinx %}
+
+.. testcode::
+   :hide:
+
+   >>> import os
+   >>> os.unlink("book.xls")
+
+{% endif %}
+
+Write data
+---------------------------------------------
+
+Export an array
+**********************
+
+Suppose you have the following array:
+
+.. code-block:: python
+
+   >>> data = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
+
+And here is the code to save it as an excel file :
+
+.. code-block:: python
+
+   >>> p.save_as(array=data, dest_file_name="example.xls")
+
+Let's verify it:
+
+.. code-block:: python
+
+    >>> p.get_sheet(file_name="example.xls")
+    pyexcel_sheet1:
+    +---+---+---+
+    | 1 | 2 | 3 |
+    +---+---+---+
+    | 4 | 5 | 6 |
+    +---+---+---+
+    | 7 | 8 | 9 |
+    +---+---+---+
+
+{% if sphinx %}
+.. testcode::
+   :hide:
+
+   >>> import os
+   >>> os.unlink("example.xls")
+{% endif %}
+
+And here is the code to save it as a csv file :
+
+.. code-block:: python
+
+   >>> p.save_as(array=data,
+   ...           dest_file_name="example.csv",
+   ...           dest_delimiter=':')
+
+Let's verify it:
+
+.. code-block:: python
+
+   >>> with open("example.csv") as f:
+   ...     for line in f.readlines():
+   ...         print(line.rstrip())
+   ...
+   1:2:3
+   4:5:6
+   7:8:9
+
+Export a list of dictionaries
+**********************************
+
+.. code-block:: python
+
+    >>> records = [
+    ...     {"year": 1903, "country": "Germany", "speed": "206.7km/h"},
+    ...     {"year": 1964, "country": "Japan", "speed": "210km/h"},
+    ...     {"year": 2008, "country": "China", "speed": "350km/h"}
+    ... ]
+    >>> p.save_as(records=records, dest_file_name='high_speed_rail.xls')
+
+
+Export a dictionary of single key value pair
+********************************************************************************
+
+.. code-block:: python
+
+    >>> henley_on_thames_facts = {
+    ...     "area": "5.58 square meters",
+    ...     "population": "11,619",
+    ...     "civial parish": "Henley-on-Thames",
+    ...     "latitude": "51.536",
+    ...     "longitude": "-0.898"
+    ... }
+    >>> p.save_as(adict=henley_on_thames_facts, dest_file_name='henley.xlsx')
+
+
+Export a dictionary of single dimensonal array
+********************************************************************************
+
+.. code-block:: python
+
+    >>> ccs_insights = {
+    ...     "year": ["2017", "2018", "2019", "2020", "2021"],
+    ...     "smart phones": [1.53, 1.64, 1.74, 1.82, 1.90],
+    ...     "feature phones": [0.46, 0.38, 0.30, 0.23, 0.17]
+    ... }
+    >>> p.save_as(adict=ccs_insights, dest_file_name='ccs.csv')
+
+
+Export a dictionary of two dimensional array as a book
+********************************************************************************
+
+Suppose you want to save the below dictionary to an excel file :
+
+.. code-block:: python
+
+   >>> a_dictionary_of_two_dimensional_arrays = {
+   ...      'Sheet 1':
+   ...          [
+   ...              [1.0, 2.0, 3.0],
+   ...              [4.0, 5.0, 6.0],
+   ...              [7.0, 8.0, 9.0]
+   ...          ],
+   ...      'Sheet 2':
+   ...          [
+   ...              ['X', 'Y', 'Z'],
+   ...              [1.0, 2.0, 3.0],
+   ...              [4.0, 5.0, 6.0]
+   ...          ],
+   ...      'Sheet 3':
+   ...          [
+   ...              ['O', 'P', 'Q'],
+   ...              [3.0, 2.0, 1.0],
+   ...              [4.0, 3.0, 2.0]
+   ...          ]
+   ...  }
+
+Here is the code:
+
+.. code-block:: python
+
+   >>> p.save_book_as(
+   ...    bookdict=a_dictionary_of_two_dimensional_arrays,
+   ...    dest_file_name="book.xls"
+   ... )
+
+If you want to preserve the order of sheets in your dictionary, you have to
+pass on an ordered dictionary to the function itself. For example:
+
+.. code-block:: python
+
+   >>> data = OrderedDict()
+   >>> data.update({"Sheet 2": a_dictionary_of_two_dimensional_arrays['Sheet 2']})
+   >>> data.update({"Sheet 1": a_dictionary_of_two_dimensional_arrays['Sheet 1']})
+   >>> data.update({"Sheet 3": a_dictionary_of_two_dimensional_arrays['Sheet 3']})
+   >>> p.save_book_as(bookdict=data, dest_file_name="book.xls")
+
+Let's verify its order:
+
+.. code-block:: python
+
+   >>> book_dict = p.get_book_dict(file_name="book.xls")
+   >>> for key, item in book_dict.items():
+   ...     print(json.dumps({key: item}))
+   {"Sheet 2": [["X", "Y", "Z"], [1, 2, 3], [4, 5, 6]]}
+   {"Sheet 1": [[1, 2, 3], [4, 5, 6], [7, 8, 9]]}
+   {"Sheet 3": [["O", "P", "Q"], [3, 2, 1], [4, 3, 2]]}
+
+Please notice that "Sheet 2" is the first item in the *book_dict*, meaning the order of sheets are preserved.
+
+
+Transcoding
+-------------------------------------------
+
+.. note::
+
+   Please note that `pyexcel-cli` can perform file transcoding at command line.
+   No need to open your editor, save the problem, then python run.
+
+{% if sphinx %}
+.. testcode::
+   :hide:
+
+   >>> import datetime
+   >>> data = [
+   ...    ["name", "weight", "birth"],
+   ...    ["Adam", 3.4, datetime.date(2015, 2, 3)],
+   ...    ["Smith", 4.2, datetime.date(2014, 11, 12)]
+   ... ]
+   >>> p.save_as(array=data, dest_file_name="birth.xls")
+
+{% endif %}
+
+The following code does a simple file format transcoding from xls to csv:
+
+.. code-block:: python
+
+   >>> p.save_as(file_name="birth.xls", dest_file_name="birth.csv")
+
+Again it is really simple. Let's verify what we have gotten:
+
+.. code-block:: python
+
+   >>> sheet = p.get_sheet(file_name="birth.csv")
+   >>> sheet
+   birth.csv:
+   +-------+--------+----------+
+   | name  | weight | birth    |
+   +-------+--------+----------+
+   | Adam  | 3.4    | 03/02/15 |
+   +-------+--------+----------+
+   | Smith | 4.2    | 12/11/14 |
+   +-------+--------+----------+
+
+.. NOTE::
+
+   Please note that csv(comma separate value) file is pure text file. Formula, charts, images and formatting in xls file will disappear no matter which transcoding tool you use. Hence, pyexcel is a quick alternative for this transcoding job.
+
+
+Let use previous example and save it as xlsx instead
+
+.. code-block:: python
+
+   >>> p.save_as(file_name="birth.xls",
+   ...           dest_file_name="birth.xlsx") # change the file extension
+
+Again let's verify what we have gotten:
+
+.. code-block:: python
+
+   >>> sheet = p.get_sheet(file_name="birth.xlsx")
+   >>> sheet
+   pyexcel_sheet1:
+   +-------+--------+----------+
+   | name  | weight | birth    |
+   +-------+--------+----------+
+   | Adam  | 3.4    | 03/02/15 |
+   +-------+--------+----------+
+   | Smith | 4.2    | 12/11/14 |
+   +-------+--------+----------+
+
+
+Excel book merge and split operation in one line
+--------------------------------------------------------------------------------
+
+Merge all excel files in directory into  a book where each file become a sheet
+********************************************************************************
+
+The following code will merge every excel files into one file, say "output.xls":
+
+.. code-block:: python
+
+    from pyexcel.cookbook import merge_all_to_a_book
+    import glob
+
+
+    merge_all_to_a_book(glob.glob("your_csv_directory\*.csv"), "output.xls")
+
+You can mix and match with other excel formats: xls, xlsm and ods. For example, if you are sure you have only xls, xlsm, xlsx, ods and csv files in `your_excel_file_directory`, you can do the following:
+
+.. code-block:: python
+
+    from pyexcel.cookbook import merge_all_to_a_book
+    import glob
+
+
+    merge_all_to_a_book(glob.glob("your_excel_file_directory\*.*"), "output.xls")
+
+Split a book into single sheet files
+****************************************
+
+{% if sphinx %}
+.. testcode::
+   :hide:
+
+    >>> content = {
+    ...     'Sheet 1':
+    ...         [
+    ...             [1.0, 2.0, 3.0],
+    ...             [4.0, 5.0, 6.0],
+    ...             [7.0, 8.0, 9.0]
+    ...         ],
+    ...     'Sheet 2':
+    ...         [
+    ...             ['X', 'Y', 'Z'],
+    ...             [1.0, 2.0, 3.0],
+    ...             [4.0, 5.0, 6.0]
+    ...         ],
+    ...     'Sheet 3':
+    ...         [
+    ...             ['O', 'P', 'Q'],
+    ...             [3.0, 2.0, 1.0],
+    ...             [4.0, 3.0, 2.0]
+    ...         ]
+    ... }
+    >>> book = p.Book(content)
+    >>> book.save_as("megabook.xls")
+
+{% endif %}
+
+Suppose you have many sheets in a work book and you would like to separate each into a single sheet excel file. You can easily do this:
+
+.. code-block:: python
+
+   >>> from pyexcel.cookbook import split_a_book
+   >>> split_a_book("megabook.xls", "output.xls")
+   >>> import glob
+   >>> outputfiles = glob.glob("*_output.xls")
+   >>> for file in sorted(outputfiles):
+   ...     print(file)
+   ...
+   Sheet 1_output.xls
+   Sheet 2_output.xls
+   Sheet 3_output.xls
+
+for the output file, you can specify any of the supported formats
+
+{% if sphinx %}
+.. testcode::
+   :hide:
+
+   >>> os.unlink("Sheet 1_output.xls")
+   >>> os.unlink("Sheet 2_output.xls")
+   >>> os.unlink("Sheet 3_output.xls")
+{% endif %}
+
+Extract just one sheet from a book
+*************************************
+
+
+Suppose you just want to extract one sheet from many sheets that exists in a work book and you would like to separate it into a single sheet excel file. You can easily do this:
+
+.. code-block:: python
+
+    >>> from pyexcel.cookbook import extract_a_sheet_from_a_book
+    >>> extract_a_sheet_from_a_book("megabook.xls", "Sheet 1", "output.xls")
+    >>> if os.path.exists("Sheet 1_output.xls"):
+    ...     print("Sheet 1_output.xls exists")
+    ...
+    Sheet 1_output.xls exists
+
+for the output file, you can specify any of the supported formats
+
+{% if sphinx %}
+.. testcode::
+   :hide:
+
+   >>> os.unlink("Sheet 1_output.xls")
+   >>> os.unlink("megabook.xls")
+   >>> os.unlink('birth.xls')
+   >>> os.unlink('birth.csv')
+   >>> os.unlink('birth.xlsx')
+   >>> os.unlink('high_speed_rail.xls')
+   >>> os.unlink('henley.xlsx')
+   >>> os.unlink('ccs.csv')
+   >>> os.unlink("book.xls")
+   >>> os.unlink("your_file.xls")
+   >>> os.unlink("example.csv")
+{% endif %}
\ No newline at end of file
diff --git a/.moban.d/partial-data.rst.jj2 b/.moban.d/partial-data.rst.jj2
new file mode 100644
index 00000000..e83b9e6c
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+++ b/.moban.d/partial-data.rst.jj2
@@ -0,0 +1,187 @@
+
+When you are dealing with huge amount of data, e.g. 64GB, obviously you would not
+like to fill up your memory with those data. What you may want to do is, record
+data from Nth line, take M records and stop. And you only want to use your memory
+for the M records, not for beginning part nor for the tail part.
+
+Hence partial read feature is developed to read partial data into memory for
+processing. 
+
+You can paginate by row, by column and by both, hence you dictate what portion of the
+data to read back. But remember only row limit features help you save memory. Let's
+you use this feature to record data from Nth column, take M number of columns and skip
+the rest. You are not going to reduce your memory footprint.
+
+Why did not I see above benefit?
+--------------------------------------------------------------------------------
+
+This feature depends heavily on the implementation details.
+
+`pyexcel-xls`_ (xlrd), `pyexcel-xlsx`_ (openpyxl), `pyexcel-ods`_ (odfpy) and
+`pyexcel-ods3`_ (pyexcel-ezodf) will read all data into memory. Because xls,
+xlsx and ods file are effective a zipped folder, all four will unzip the folder
+and read the content in xml format in **full**, so as to make sense of all details.
+
+Hence, during the partial data is been returned, the memory consumption won't
+differ from reading the whole data back. Only after the partial
+data is returned, the memory comsumption curve shall jump the cliff. So pagination
+code here only limits the data returned to your program.
+
+With that said, `pyexcel-xlsxr`_, `pyexcel-odsr`_ and `pyexcel-htmlr`_ DOES read
+partial data into memory. Those three are implemented in such a way that they
+consume the xml(html) when needed. When they have read designated portion of the
+data, they stop, even if they are half way through.
+
+In addition, pyexcel's csv readers can read partial data into memory too.
+
+{% if sphinx %}
+
+.. testcode::
+   :hide:
+
+    >>> import sys
+    >>> if sys.version_info[0] < 3:
+    ...     from StringIO import StringIO
+    ... else:
+    ...     from io import StringIO
+    >>> from pyexcel_io._compact import OrderedDict
+
+{% endif %}
+
+Let's assume the following file is a huge csv file:
+
+.. code-block:: python
+
+   >>> import datetime
+   >>> import pyexcel as pe
+   >>> data = [
+   ...     [1, 21, 31],
+   ...     [2, 22, 32],
+   ...     [3, 23, 33],
+   ...     [4, 24, 34],
+   ...     [5, 25, 35],
+   ...     [6, 26, 36]
+   ... ]
+   >>> pe.save_as(array=data, dest_file_name="your_file.csv")
+
+
+And let's pretend to read partial data:
+
+
+.. code-block:: python
+
+   >>> pe.get_sheet(file_name="your_file.csv", start_row=2, row_limit=3)
+   your_file.csv:
+   +---+----+----+
+   | 3 | 23 | 33 |
+   +---+----+----+
+   | 4 | 24 | 34 |
+   +---+----+----+
+   | 5 | 25 | 35 |
+   +---+----+----+
+
+And you could as well do the same for columns:
+
+.. code-block:: python
+
+   >>> pe.get_sheet(file_name="your_file.csv", start_column=1, column_limit=2)
+   your_file.csv:
+   +----+----+
+   | 21 | 31 |
+   +----+----+
+   | 22 | 32 |
+   +----+----+
+   | 23 | 33 |
+   +----+----+
+   | 24 | 34 |
+   +----+----+
+   | 25 | 35 |
+   +----+----+
+   | 26 | 36 |
+   +----+----+
+
+Obvious, you could do both at the same time:
+
+.. code-block:: python
+
+   >>> pe.get_sheet(file_name="your_file.csv",
+   ...     start_row=2, row_limit=3,
+   ...     start_column=1, column_limit=2)
+   your_file.csv:
+   +----+----+
+   | 23 | 33 |
+   +----+----+
+   | 24 | 34 |
+   +----+----+
+   | 25 | 35 |
+   +----+----+
+
+
+The pagination support is available across all pyexcel plugins.
+
+.. note::
+
+   No column pagination support for query sets as data source. 
+
+
+Formatting while transcoding a big data file
+--------------------------------------------------------------------------------
+
+If you are transcoding a big data set, conventional formatting method would not
+help unless a on-demand free RAM is available. However, there is a way to minimize
+the memory footprint of pyexcel while the formatting is performed.
+
+Let's continue from previous example. Suppose we want to transcode "your_file.csv"
+to "your_file.xls" but increase each element by 1.
+
+What we can do is to define a row renderer function as the following:
+
+.. code-block:: python
+
+   >>> def increment_by_one(row):
+   ...     for element in row:
+   ...         yield element + 1
+
+Then pass it onto save_as function using row_renderer:
+
+.. code-block:: python
+
+   >>> pe.isave_as(file_name="your_file.csv",
+   ...             row_renderer=increment_by_one,
+   ...             dest_file_name="your_file.xlsx")
+
+
+.. note::
+
+   If the data content is from a generator, isave_as has to be used.
+   
+We can verify if it was done correctly:
+
+.. code-block:: python
+
+   >>> pe.get_sheet(file_name="your_file.xlsx")
+   your_file.csv:
+   +---+----+----+
+   | 2 | 22 | 32 |
+   +---+----+----+
+   | 3 | 23 | 33 |
+   +---+----+----+
+   | 4 | 24 | 34 |
+   +---+----+----+
+   | 5 | 25 | 35 |
+   +---+----+----+
+   | 6 | 26 | 36 |
+   +---+----+----+
+   | 7 | 27 | 37 |
+   +---+----+----+
+
+{% if sphinx %}
+
+.. testcode::
+   :hide:
+
+    >>> import os
+    >>> os.unlink("your_file.csv")
+    >>> os.unlink("your_file.xlsx")
+
+{% endif %}
\ No newline at end of file
diff --git a/.moban.d/pyexcel-README.rst.jj2 b/.moban.d/pyexcel-README.rst.jj2
new file mode 100644
index 00000000..33e7db1c
--- /dev/null
+++ b/.moban.d/pyexcel-README.rst.jj2
@@ -0,0 +1,53 @@
+{%extends "BASIC-README.rst.jj2"%}
+
+{%block features%}
+
+Feature Highlights
+===================
+
+.. image:: https://github.com/pyexcel/pyexcel/raw/dev/docs/source/_static/images/architecture.svg
+
+
+1. One application programming interface(API) to handle multiple data sources:
+
+   * physical file
+   * memory file
+   * SQLAlchemy table
+   * Django Model
+   * Python data structures: dictionary, records and array
+
+2. One API to read and write data in various excel file formats.
+3. For large data sets, data streaming are supported. A genenerator can be returned to you. Checkout iget_records, iget_array, isave_as and isave_book_as.
+
+{% endblock %}
+
+{%block usage%}
+
+{%include "one-liners.rst.jj2" %}
+
+Hidden feature: partial read
+===============================================
+
+Most pyexcel users do not know, but other library users were requesting `the similar features <https://github.com/jazzband/tablib/issues/467>`_
+
+{%include "partial-data.rst.jj2" %}
+
+{%include "two-liners.rst.jj2" %}
+
+Available Plugins
+=================
+
+{% include "plugins-list.rst.jj2" %}
+
+
+Acknowledgement
+===============
+
+All great work have been done by odf, ezodf, xlrd, xlwt, tabulate and other
+individual developers. This library unites only the data access code.
+
+
+{%endblock%}
+
+{%block development_guide%}
+{%endblock%}
diff --git a/.moban.d/travis.yml b/.moban.d/pyexcel-travis.yml.jj2
similarity index 51%
rename from .moban.d/travis.yml
rename to .moban.d/pyexcel-travis.yml.jj2
index 107423d9..73b434ac 100644
--- a/.moban.d/travis.yml
+++ b/.moban.d/pyexcel-travis.yml.jj2
@@ -2,12 +2,14 @@
 {%block extra_matrix %}
 matrix:
   include:
-    - python: 2.7
+    - python: 3.6
       env: MINREQ=1
 {%endblock%}
-{%block custom_install%}
-  - if [[ $TRAVIS_PYTHON_VERSION == "pypy" ]]; then rm tests/test_examples.py; fi
+{%block custom_python_versions%}
+python:
+  - 3.8
+  - 3.7
+  - 3.6
 {%endblock%}
-
 {%block pypi_deployment%}
 {%endblock %}
\ No newline at end of file
diff --git a/.moban.d/test.bat b/.moban.d/test.bat
deleted file mode 100644
index 82ba8fdc..00000000
--- a/.moban.d/test.bat
+++ /dev/null
@@ -1,8 +0,0 @@
-{% extends "test.script.jj2" %}
-
-{%block flake8_options%}
---builtins=unicode,xrange,long
-{%endblock%}
-
-
-
diff --git a/.moban.d/test.sh b/.moban.d/test.sh
deleted file mode 100644
index 1bf8b507..00000000
--- a/.moban.d/test.sh
+++ /dev/null
@@ -1,9 +0,0 @@
-{% extends "test.script.jj2" %}
-
-{%block pretest %}
-#/bin/bash
-{%endblock %}
-
-{%block flake8_options%}
---builtins=unicode,xrange,long
-{%endblock%}
diff --git a/.moban.d/tests/requirements.txt b/.moban.d/tests/custom_requirements.txt.jj2
similarity index 100%
rename from .moban.d/tests/requirements.txt
rename to .moban.d/tests/custom_requirements.txt.jj2
diff --git a/.moban.d/two-liners.rst.jj2 b/.moban.d/two-liners.rst.jj2
new file mode 100644
index 00000000..619d0cb3
--- /dev/null
+++ b/.moban.d/two-liners.rst.jj2
@@ -0,0 +1,363 @@
+Stream APIs for big file : A set of two liners
+================================================================================
+
+When you are dealing with **BIG** excel files, you will want **pyexcel** to use
+constant memory.
+
+This section shows you how to get data from your **BIG** excel files and how to
+export data to excel files in **two lines** at most, without eating all
+your computer memory.
+
+
+Two liners for get data from big excel files
+--------------------------------------------------------------------------------
+
+Get a list of dictionaries
+********************************************************************************
+
+{% if sphinx %}
+.. testcode::
+   :hide:
+
+   >>> import os
+   >>> import pyexcel as p
+   >>> content="""
+   ... Coffees,Serving Size,Caffeine (mg)
+   ... Starbucks Coffee Blonde Roast,venti(20 oz),475
+   ... Dunkin' Donuts Coffee with Turbo Shot,large(20 oz.),398
+   ... Starbucks Coffee Pike Place Roast,grande(16 oz.),310
+   ... Panera Coffee Light Roast,regular(16 oz.),300
+   ... """.strip()
+   >>> sheet = p.get_sheet(file_content=content, file_type='csv')
+   >>> sheet.save_as("your_file.xls")
+
+{% endif %}
+
+
+{% if sphinx %}
+Suppose you want to process the following coffee data:
+
+.. pyexcel-table::
+
+   ---pyexcel:Huge list of coffeine drinks---
+   Coffees,Serving Size,Caffeine (mg)
+   Starbucks Coffee Blonde Roast,venti(20 oz),475
+   Dunkin' Donuts Coffee with Turbo Shot,large(20 oz.),398
+   Starbucks Coffee Pike Place Roast,grande(16 oz.),310
+   Panera Coffee Light Roast,regular(16 oz.),300
+{% else %}
+Suppose you want to process the following coffee data again:
+
+Top 5 coffeine drinks:
+
+=====================================  ===============  =============
+Coffees                                Serving Size     Caffeine (mg)
+Starbucks Coffee Blonde Roast          venti(20 oz)     475
+Dunkin' Donuts Coffee with Turbo Shot  large(20 oz.)    398
+Starbucks Coffee Pike Place Roast      grande(16 oz.)   310
+Panera Coffee Light Roast              regular(16 oz.)  300
+=====================================  ===============  =============
+
+{% endif %}
+
+Let's get a list of dictionary out from the xls file:
+
+.. code-block:: python
+
+   >>> records = p.iget_records(file_name="your_file.xls")
+
+And let's check what do we have:
+
+.. code-block:: python
+
+   >>> for r in records:
+   ...     print(f"{r['Serving Size']} of {r['Coffees']} has {r['Caffeine (mg)']} mg")
+   venti(20 oz) of Starbucks Coffee Blonde Roast has 475 mg
+   large(20 oz.) of Dunkin' Donuts Coffee with Turbo Shot has 398 mg
+   grande(16 oz.) of Starbucks Coffee Pike Place Roast has 310 mg
+   regular(16 oz.) of Panera Coffee Light Roast has 300 mg
+
+Please do not forgot the second line to close the opened file handle:
+
+.. code-block:: python
+
+   >>> p.free_resources()
+
+Get two dimensional array
+********************************************************************************
+
+Instead, what if you have to use `pyexcel.get_array` to do the same:
+
+.. code-block:: python
+
+   >>> for row in p.iget_array(file_name="your_file.xls", start_row=1):
+   ...     print(f"{row[1]} of {row[0]} has {row[2]} mg")
+   venti(20 oz) of Starbucks Coffee Blonde Roast has 475 mg
+   large(20 oz.) of Dunkin' Donuts Coffee with Turbo Shot has 398 mg
+   grande(16 oz.) of Starbucks Coffee Pike Place Roast has 310 mg
+   regular(16 oz.) of Panera Coffee Light Roast has 300 mg
+
+Again, do not forgot the second line:
+
+.. code-block:: python
+
+   >>> p.free_resources()
+
+where `start_row` skips the header row.
+
+Data export in one liners
+---------------------------------------------
+
+Export an array
+**********************
+
+Suppose you have the following array:
+
+.. code-block:: python
+
+   >>> data = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
+
+And here is the code to save it as an excel file :
+
+.. code-block:: python
+
+   >>> p.isave_as(array=data, dest_file_name="example.xls")
+
+But the following line is not required because the data source
+are not file sources:
+
+.. code-block:: python
+
+   >>> # p.free_resources()
+
+Let's verify it:
+
+.. code-block:: python
+
+    >>> p.get_sheet(file_name="example.xls")
+    pyexcel_sheet1:
+    +---+---+---+
+    | 1 | 2 | 3 |
+    +---+---+---+
+    | 4 | 5 | 6 |
+    +---+---+---+
+    | 7 | 8 | 9 |
+    +---+---+---+
+
+{% if sphinx %}
+
+.. testcode::
+   :hide:
+
+   >>> import os
+   >>> os.unlink("example.xls")
+
+{% endif %}
+
+And here is the code to save it as a csv file :
+
+.. code-block:: python
+
+   >>> p.isave_as(array=data,
+   ...            dest_file_name="example.csv",
+   ...            dest_delimiter=':')
+
+Let's verify it:
+
+.. code-block:: python
+
+   >>> with open("example.csv") as f:
+   ...     for line in f.readlines():
+   ...         print(line.rstrip())
+   ...
+   1:2:3
+   4:5:6
+   7:8:9
+
+Export a list of dictionaries
+**********************************
+
+.. code-block:: python
+
+    >>> records = [
+    ...     {"year": 1903, "country": "Germany", "speed": "206.7km/h"},
+    ...     {"year": 1964, "country": "Japan", "speed": "210km/h"},
+    ...     {"year": 2008, "country": "China", "speed": "350km/h"}
+    ... ]
+    >>> p.isave_as(records=records, dest_file_name='high_speed_rail.xls')
+
+Export a dictionary of single key value pair
+********************************************************************************
+
+.. code-block:: python
+
+    >>> henley_on_thames_facts = {
+    ...     "area": "5.58 square meters",
+    ...     "population": "11,619",
+    ...     "civial parish": "Henley-on-Thames",
+    ...     "latitude": "51.536",
+    ...     "longitude": "-0.898"
+    ... }
+    >>> p.isave_as(adict=henley_on_thames_facts, dest_file_name='henley.xlsx')
+
+Export a dictionary of single dimensonal array
+********************************************************************************
+
+.. code-block:: python
+
+    >>> ccs_insights = {
+    ...     "year": ["2017", "2018", "2019", "2020", "2021"],
+    ...     "smart phones": [1.53, 1.64, 1.74, 1.82, 1.90],
+    ...     "feature phones": [0.46, 0.38, 0.30, 0.23, 0.17]
+    ... }
+    >>> p.isave_as(adict=ccs_insights, dest_file_name='ccs.csv')
+    >>> p.free_resources()
+
+Export a dictionary of two dimensional array as a book
+********************************************************************************
+
+Suppose you want to save the below dictionary to an excel file :
+
+.. code-block:: python
+
+   >>> a_dictionary_of_two_dimensional_arrays = {
+   ...      'Sheet 1':
+   ...          [
+   ...              [1.0, 2.0, 3.0],
+   ...              [4.0, 5.0, 6.0],
+   ...              [7.0, 8.0, 9.0]
+   ...          ],
+   ...      'Sheet 2':
+   ...          [
+   ...              ['X', 'Y', 'Z'],
+   ...              [1.0, 2.0, 3.0],
+   ...              [4.0, 5.0, 6.0]
+   ...          ],
+   ...      'Sheet 3':
+   ...          [
+   ...              ['O', 'P', 'Q'],
+   ...              [3.0, 2.0, 1.0],
+   ...              [4.0, 3.0, 2.0]
+   ...          ]
+   ...  }
+
+Here is the code:
+
+.. code-block:: python
+
+   >>> p.isave_book_as(
+   ...    bookdict=a_dictionary_of_two_dimensional_arrays,
+   ...    dest_file_name="book.xls"
+   ... )
+
+If you want to preserve the order of sheets in your dictionary, you have to
+pass on an ordered dictionary to the function itself. For example:
+
+.. code-block:: python
+
+   >>> from pyexcel._compact import OrderedDict
+   >>> data = OrderedDict()
+   >>> data.update({"Sheet 2": a_dictionary_of_two_dimensional_arrays['Sheet 2']})
+   >>> data.update({"Sheet 1": a_dictionary_of_two_dimensional_arrays['Sheet 1']})
+   >>> data.update({"Sheet 3": a_dictionary_of_two_dimensional_arrays['Sheet 3']})
+   >>> p.isave_book_as(bookdict=data, dest_file_name="book.xls")
+   >>> p.free_resources()
+
+Let's verify its order:
+
+.. code-block:: python
+
+   >>> import json
+   >>> book_dict = p.get_book_dict(file_name="book.xls")
+   >>> for key, item in book_dict.items():
+   ...     print(json.dumps({key: item}))
+   {"Sheet 2": [["X", "Y", "Z"], [1, 2, 3], [4, 5, 6]]}
+   {"Sheet 1": [[1, 2, 3], [4, 5, 6], [7, 8, 9]]}
+   {"Sheet 3": [["O", "P", "Q"], [3, 2, 1], [4, 3, 2]]}
+
+Please notice that "Sheet 2" is the first item in the *book_dict*, meaning the order of sheets are preserved.
+
+
+File format transcoding on one line
+-------------------------------------------
+
+.. note::
+
+   Please note that the following file transcoding could be with zero line. Please
+   install pyexcel-cli and you will do the transcode in one command. No need to
+   open your editor, save the problem, then python run.
+
+{% if sphinx %}
+
+.. testcode::
+   :hide:
+
+   >>> import datetime
+   >>> data = [
+   ...    ["name", "weight", "birth"],
+   ...    ["Adam", 3.4, datetime.date(2015, 2, 3)],
+   ...    ["Smith", 4.2, datetime.date(2014, 11, 12)]
+   ... ]
+   >>> p.isave_as(array=data, dest_file_name="birth.xls")
+
+{% endif %}
+
+The following code does a simple file format transcoding from xls to csv:
+
+.. code-block:: python
+
+   >>> import pyexcel
+   >>> p.save_as(file_name="birth.xls", dest_file_name="birth.csv")
+
+Again it is really simple. Let's verify what we have gotten:
+
+.. code-block:: python
+
+   >>> sheet = p.get_sheet(file_name="birth.csv")
+   >>> sheet
+   birth.csv:
+   +-------+--------+----------+
+   | name  | weight | birth    |
+   +-------+--------+----------+
+   | Adam  | 3.4    | 03/02/15 |
+   +-------+--------+----------+
+   | Smith | 4.2    | 12/11/14 |
+   +-------+--------+----------+
+
+.. note::
+
+   Please note that csv(comma separate value) file is pure text file. Formula, charts, images and formatting in xls file will disappear no matter which transcoding tool you use. Hence, pyexcel is a quick alternative for this transcoding job.
+
+
+Let use previous example and save it as xlsx instead
+
+.. code-block:: python
+
+   >>> import pyexcel
+   >>> p.isave_as(file_name="birth.xls",
+   ...            dest_file_name="birth.xlsx") # change the file extension
+
+Again let's verify what we have gotten:
+
+.. code-block:: python
+
+   >>> sheet = p.get_sheet(file_name="birth.xlsx")
+   >>> sheet
+   pyexcel_sheet1:
+   +-------+--------+----------+
+   | name  | weight | birth    |
+   +-------+--------+----------+
+   | Adam  | 3.4    | 03/02/15 |
+   +-------+--------+----------+
+   | Smith | 4.2    | 12/11/14 |
+   +-------+--------+----------+
+
+{% if sphinx %}
+.. testcode::
+   :hide:
+
+   >>> import os
+   >>> os.unlink('ccs.csv')
+   >>> os.unlink('book.xls')
+
+{% endif %}
diff --git a/.moban.yml b/.moban.yml
index 5482f32b..dfa4bd09 100644
--- a/.moban.yml
+++ b/.moban.yml
@@ -1,32 +1,19 @@
-requires:
-  - type: git
-    url: https://github.com/moremoban/pypi-mobans
-    submodule: true
-  - https://github.com/pyexcel/pyexcel-mobans
+overrides: "git://github.com/pyexcel/pyexcel-mobans!/mobanfile.yaml"
 configuration:
-  configuration_dir: "pyexcel-mobans:config"
-  template_dir:
-    - "pyexcel-mobans:templates"
-    - "pypi-mobans:templates"
-    - ".moban.d"
   configuration: pyexcel.yml
 targets:
-  - setup.py: setup.py
+  - setup.py: custom_setup.py.jj2
   - "docs/source/conf.py": "docs/source/custom_conf.py.jj2"
-  - .travis.yml: travis.yml
-  - requirements.txt: requirements.txt.jj2
-  - min_requirements.txt: minimum_requirements.txt
-  - "tests/requirements.txt": "tests/requirements.txt"
-  - LICENSE: NEW_BSD_LICENSE.jj2
+  - "docs/source/quickstart.rst": "docs/source/quickstart.rst.jj2"
+  - "docs/source/two-liners.rst": "docs/source/two-liners.rst.jj2"
+  - "docs/source/bigdata.rst": "docs/source/bigdata.rst.jj2"
+  - .travis.yml: pyexcel-travis.yml.jj2
   - MANIFEST.in: CUSTOM_MANIFEST.in.jj2
-  - README.rst: README.rst
-  - "docs/source/guide.rst": "docs/source/guide.rst"
-  - test.sh: test.sh
-  - test.bat: test.bat
+  - README.rst: pyexcel-README.rst.jj2
+  - "docs/source/guide.rst": "docs/source/guide.rst.jj2"
   - .gitignore: commons-gitignore.jj2
   - "pyexcel/__version__.py": version.txt
   - "docs/source/index.rst": "docs/source/pyexcel-index.rst.jj2"
-  - output: CHANGELOG.rst
-    configuration: changelog.yml
-    template: CHANGELOG.rst.jj2
-  - lint.sh: lint.script.jj2
+  - "tests/requirements.txt": "tests/custom_requirements.txt.jj2"
+  - "min_requirements.txt": "minimum_requirements.txt.jj2"
+
diff --git a/.travis.yml b/.travis.yml
index 51369ba0..1012eba6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,53 +1,44 @@
-
 sudo: false
 dist: xenial
 language: python
 notifications:
   email: false
 python:
-  - &pypy2 pypy2.7-6.0
-  - &pypy3 pypy3.5-6.0
+  - 3.8
   - 3.7
   - 3.6
-  - 3.5
-  - 2.7
 matrix:
   include:
-    - python: 2.7
+    - python: 3.6
       env: MINREQ=1
 
 stages:
-  - test
   - lint
+  - test
 
-.disable_global: &disable_global
-  before_install: false
-  install: true
-  before_script: false
-  after_success: false
-  after_failure: false
 
 .lint: &lint
-  <<: *disable_global
+  git:
+    submodules: false
   python: 3.6
+  env:
+    - MINREQ=0
   stage: lint
-  install: pip install flake8
   script: make lint
 
 jobs:
   include:
+    - *moban
     - *lint
 
 stage: test
 
-script: make test
-
 before_install:
-  - if [[ $TRAVIS_PYTHON_VERSION == "pypy" ]]; then rm tests/test_examples.py; fi
   - if [[ -f min_requirements.txt && "$MINREQ" -eq 1 ]]; then
       mv min_requirements.txt requirements.txt ;
     fi
-  - test ! -f rnd_requirements.txt || pip install --no-deps -r rnd_requirements.txt
+  - test ! -f rnd_requirements.txt ||
+    pip install --no-deps -r rnd_requirements.txt
   - test ! -f rnd_requirements.txt || pip install -r rnd_requirements.txt ;
   - pip install -r tests/requirements.txt
 script:
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index a574950c..fab303b1 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,11 +1,89 @@
 Change log
 ================================================================================
 
+0.6.6 - 14.11.2020
+--------------------------------------------------------------------------------
+
+**Updated**
+
+#. `#233 <https://github.com/pyexcel/pyexcel/issues/233>`_: dynamically resize
+   the table matrix on set_value. sheet['AA1'] = 'test' will work in this
+   release.
+
+0.6.5 - 8.10.2020
+--------------------------------------------------------------------------------
+
+**Updated**
+
+#. update queryset source to work with pyexcel-io 0.6.0
+
+0.6.4 - 18.08.2020
+--------------------------------------------------------------------------------
+
+**Updated**
+
+#. `#219 <https://github.com/pyexcel/pyexcel/issues/219>`_: book created from
+   dict no longer discards order.
+
+0.6.3 - 01.08.2020
+--------------------------------------------------------------------------------
+
+**fixed**
+
+#. `#214 <https://github.com/pyexcel/pyexcel/issues/214>`_: remove leading and
+   trailing whitespace for column names
+
+**removed**
+
+#. python 2 compatibility have been permanently removed.
+
+0.6.2 - 8.06.2020
+--------------------------------------------------------------------------------
+
+**fixed**
+
+#. `#109 <https://github.com/pyexcel/pyexcel/issues/109>`_: Control the column
+   order when write the data output
+
+0.6.1 - 02.05.2020
+--------------------------------------------------------------------------------
+
+**fixed**
+
+#. `#203 <https://github.com/pyexcel/pyexcel/issues/203>`_: texttable was
+   dropped out in 0.6.0 as compulsary dependency. end user may experience it
+   when a sheet/table is printed in a shell. otherwise, new user of pyexcel
+   won't see it. As of release date, no issues were created
+
+0.6.0 - 21.04.2020
+--------------------------------------------------------------------------------
+
+**updated**
+
+#. `#199 <https://github.com/pyexcel/pyexcel/issues/199>`_: += in place; = +
+   shall return new instance
+#. `#195 <https://github.com/pyexcel/pyexcel/issues/195>`_: documentation
+   update. however small is welcome
+
+**removed**
+
+#. Dropping the test support for python version lower than 3.6. v0.6.0 should
+   work with python 2.7 but is not guaranteed to work. Please upgrade to python
+   3.6+.
+
+0.5.15 - 07.07.2019
+--------------------------------------------------------------------------------
+
+**updated**
+
+#. `#185 <https://github.com/pyexcel/pyexcel/issues/185>`_: fix a bug with http
+   data source. The real fix lies in pyexcel-io v0.5.19. this release just put
+   the version requirement in.
+
 0.5.14 - 12.06.2019
 --------------------------------------------------------------------------------
 
-updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**updated**
 
 #. `#182 <https://github.com/pyexcel/pyexcel/issues/182>`_: support
    dest_force_file_type on save_as and save_book_as
@@ -13,8 +91,7 @@ updated
 0.5.13 - 12.03.2019
 --------------------------------------------------------------------------------
 
-updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**updated**
 
 #. `#176 <https://github.com/pyexcel/pyexcel/issues/176>`_: get_sheet
    {IndexError}list index out of range // XLSX can't be opened
@@ -22,8 +99,7 @@ updated
 0.5.12 - 25.02.2019
 --------------------------------------------------------------------------------
 
-updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**updated**
 
 #. `#174 <https://github.com/pyexcel/pyexcel/issues/174>`_: include examples in
    tarbar
@@ -31,8 +107,7 @@ updated
 0.5.11 - 22.02.2019
 --------------------------------------------------------------------------------
 
-updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**updated**
 
 #. `#169 <https://github.com/pyexcel/pyexcel/issues/169>`_: remove
    pyexcel-handsontalbe in test
@@ -41,8 +116,7 @@ updated
 0.5.10 - 3.12.2018
 --------------------------------------------------------------------------------
 
-updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**updated**
 
 #. `#157 <https://github.com/pyexcel/pyexcel/issues/157>`_: Please use
    scan_plugins_regex, which lml 0.7 complains about
@@ -51,16 +125,14 @@ updated
 0.5.9.1 - 30.08.2018
 --------------------------------------------------------------------------------
 
-updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**updated**
 
 #. to require pyexcel-io 0.5.9.1 and use lml at least version 0.0.2
 
 0.5.9 - 30.08.2018
 --------------------------------------------------------------------------------
 
-added
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**added**
 
 #. support __len__. len(book) returns the number of sheets and len(sheet)
    returns the number of rows
@@ -72,8 +144,7 @@ added
    but with .blob file suffix.
 #. finally, pyexcel got import pyexcel.__version__
 
-updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**updated**
 
 #. Sheet.to_records() returns a generator now, saving memory
 #. `#115 <https://github.com/pyexcel/pyexcel/issues/115>`_, Fix set membership
@@ -81,16 +152,14 @@ updated
 #. `#140 <https://github.com/pyexcel/pyexcel/issues/140>`_, Direct writes to
    cells yield weird results
 
-0.5.8 - unreleased
+0.5.8 - 26.03.2018
 --------------------------------------------------------------------------------
 
-added
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**added**
 
 #. `#125 <https://github.com/pyexcel/pyexcel/issues/125>`_, sort book sheets
 
-updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**updated**
 
 #. `#126 <https://github.com/pyexcel/pyexcel/issues/126>`_, dest_sheet_name in
    save_as will set the sheet name in the output
@@ -100,8 +169,7 @@ updated
 0.5.7 - 11.01.2018
 --------------------------------------------------------------------------------
 
-added
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**added**
 
 #. `pyexcel-io#46 <https://github.com/pyexcel/pyexcel-io/issues/46>`_, expose
    `bulk_save` to developer.
@@ -109,8 +177,7 @@ added
 0.5.6 - 23.10.2017
 --------------------------------------------------------------------------------
 
-removed
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**removed**
 
 #. `#105 <https://github.com/pyexcel/pyexcel/issues/105>`_, remove gease from
    setup_requires, introduced by 0.5.5.
@@ -121,8 +188,7 @@ removed
 0.5.5 - 20.10.2017
 --------------------------------------------------------------------------------
 
-removed
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**removed**
 
 #. `#105 <https://github.com/pyexcel/pyexcel/issues/105>`_, remove gease from
    setup_requires, introduced by 0.5.5.
@@ -133,22 +199,19 @@ removed
 0.5.4 - 27.09.2017
 --------------------------------------------------------------------------------
 
-fixed
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**fixed**
 
 #. `#100 <https://github.com/pyexcel/pyexcel/issues/100>`_, Sheet.to_dict() gets
    out of range error because there is only one row.
 
-updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**updated**
 
 #. Updated the baseline of pyexcel-io to 0.5.1.
 
 0.5.3 - 01-08-2017
 --------------------------------------------------------------------------------
 
-added
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**added**
 
 #. `#95 <https://github.com/pyexcel/pyexcel/issues/95>`_, respect the order of
    records in iget_records, isave_as and save_as.
@@ -158,8 +221,7 @@ added
 0.5.2 - 26-07-2017
 --------------------------------------------------------------------------------
 
-Updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated**
 
 #. embeded the enabler for pyexcel-htmlr. http source does not support text/html
    as mime type.
@@ -167,8 +229,7 @@ Updated
 0.5.1 - 12.06.2017
 --------------------------------------------------------------------------------
 
-Updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated**
 
 #. support saving SheetStream and BookStream to database targets. This is needed
    for pyexcel-webio and its downstream projects.
@@ -176,8 +237,7 @@ Updated
 0.5.0 - 19.06.2017
 --------------------------------------------------------------------------------
 
-Added
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Added**
 
 #. Sheet.top() and Sheet.top_left() for data browsing
 #. add html as default rich display in Jupyter notebook when pyexcel-text and
@@ -195,14 +255,12 @@ Added
    is enfored. free_resource is added and it should be called when iget_array,
    iget_records, isave_as and/or isave_book_as are used.
 
-Updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated**
 
 #. array is passed to pyexcel.Sheet as reference. it means your array data will
    be modified.
 
-Removed
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Removed**
 
 #. pyexcel.Writer and pyexcel.BookWriter were removed
 #. pyexcel.load_book_from_sql and pyexcel.load_from_sql were removed
@@ -214,8 +272,7 @@ Removed
 0.4.5 - 17.03.2017
 --------------------------------------------------------------------------------
 
-Updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated**
 
 #. `#80 <https://github.com/pyexcel/pyexcel/issues/80>`_: remove pyexcel-chart
    import from v0.4.x
@@ -223,8 +280,7 @@ Updated
 0.4.4 - 06.02.2017
 --------------------------------------------------------------------------------
 
-Updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated**
 
 #. `#68 <https://github.com/pyexcel/pyexcel/issues/68>`_: regression
    save_to_memory() should have returned a stream instance which has been reset
@@ -232,8 +288,7 @@ Updated
 #. `#74 <https://github.com/pyexcel/pyexcel/issues/74>`_: Not able to handle
    decimal.Decimal
 
-Removed
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Removed**
 
 #. remove get_{{file_type}}_stream functions from pyexcel.Sheet and pyexcel.Book
    introduced since 0.4.3.
@@ -241,8 +296,7 @@ Removed
 0.4.3 - 26.01.2017
 --------------------------------------------------------------------------------
 
-Added
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Added**
 
 #. '.stream' attribute are attached to `~pyexcel.Sheet` and `~pyexcel.Book` to
    get direct access the underneath stream in responding to file type
@@ -250,8 +304,7 @@ Added
    world, for example, Sheet.stream.csv gives a text stream that contains csv
    formatted data. Book.stream.xls returns a xls format data in a byte stream.
 
-Updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated**
 
 #. Better error reporting when an unknown parameters or unsupported file types
    were given to the signature functions.
@@ -259,8 +312,7 @@ Updated
 0.4.2 - 17.01.2017
 --------------------------------------------------------------------------------
 
-Updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated**
 
 #. Raise exception if the incoming sheet does not have column names. In other
    words, only sheet with column names could be saved to database. sheet with
@@ -280,8 +332,7 @@ Updated
 0.4.1 - 23.12.2016
 --------------------------------------------------------------------------------
 
-Updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated**
 
 #. `#68 <https://github.com/pyexcel/pyexcel/issues/68>`_: regression
    save_to_memory() should have returned a stream instance.
@@ -289,16 +340,14 @@ Updated
 0.4.0 - 22.12.2016
 --------------------------------------------------------------------------------
 
-Added
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Added**
 
 #. `Flask-Excel#19 <https://github.com/pyexcel/Flask-Excel/issues/19>`_ allow
    sheet_name parameter
 #. `pyexcel-xls#11 <https://github.com/pyexcel/pyexcel-xls/issues/11>`_
    case-insensitive for file_type. `xls` and `XLS` are treated in the same way
 
-Updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated**
 
 #. `#66 <https://github.com/pyexcel/pyexcel/issues/66>`_: `export_columns` is
    ignored
@@ -307,8 +356,7 @@ Updated
 0.3.3 - 07.11.2016
 --------------------------------------------------------------------------------
 
-Updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated**
 
 #. `#63 <https://github.com/pyexcel/pyexcel/issues/63>`_: cannot display empty
    sheet(hence book with empty sheet) as texttable
@@ -316,8 +364,7 @@ Updated
 0.3.2 - 02.11.2016
 --------------------------------------------------------------------------------
 
-Updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated**
 
 #. `#62 <https://github.com/pyexcel/pyexcel/issues/62>`_: optional module import
    error become visible.
@@ -325,8 +372,7 @@ Updated
 0.3.0 - 28.10.2016
 --------------------------------------------------------------------------------
 
-Added:
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Added:**
 
 #. file type setters for Sheet and Book, and its documentation
 #. `iget_records` returns a generator for a list of records and should have
@@ -336,8 +382,7 @@ Added:
    files.
 #. Enable pagination support, and custom row renderer via pyexcel-io v0.2.3
 
-Updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated**
 
 #. Take `isave_as` out from `save_as`. Hence two functions are there for save a
    sheet as
@@ -364,8 +409,7 @@ Updated
    actual content. No longer they will return a io object hence you cannot call
    getvalue() on them.
 
-Removed:
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Removed:**
 
 #. `content` and `out_file` as function parameters to the signature functions
    are no longer supported.
@@ -415,8 +459,7 @@ Removed:
 0.2.5 - 31.08.2016
 --------------------------------------------------------------------------------
 
-Updated:
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated:**
 
 #. `#58 <https://github.com/pyexcel/pyexcel/issues/58>`_: texttable should have
    been made as compulsory requirement
@@ -424,16 +467,14 @@ Updated:
 0.2.4 - 14.07.2016
 --------------------------------------------------------------------------------
 
-Updated:
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated:**
 
 #. For python 2, writing to sys.stdout by pyexcel-cli raise IOError.
 
 0.2.3 - 11.07.2016
 --------------------------------------------------------------------------------
 
-Updated:
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated:**
 
 #. For python 3, do not seek 0 when saving to memory if sys.stdout is passed on.
    Hence, adding support for sys.stdin and sys.stdout.
@@ -441,8 +482,7 @@ Updated:
 0.2.2 - 01.06.2016
 --------------------------------------------------------------------------------
 
-Updated:
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated:**
 
 #. Explicit imports, no longer needed
 #. Depends on latest setuptools 18.0.1
@@ -453,15 +493,13 @@ Updated:
 0.2.1 - 23.04.2016
 --------------------------------------------------------------------------------
 
-Added:
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Added:**
 
 #. add pyexcel-text file types as attributes of pyexcel.Sheet and pyexcel.Book,
    related to `#31 <https://github.com/pyexcel/pyexcel/issues/31>`__
 #. auto import pyexcel-text if it is pip installed
 
-Updated:
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated:**
 
 #. code refactoring done for easy addition of sources.
 #. bug fix `#29 <https://github.com/pyexcel/pyexcel/issues/29>`__, Even if the
@@ -469,8 +507,7 @@ Updated:
 #. pyexcel-text is no longer a plugin to pyexcel-io but to pyexcel.sources, see
    `pyexcel-text#22 <https://github.com/pyexcel/pyexcel-text/issues/22>`__
 
-Removed:
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Removed:**
 
 #. pyexcel.presentation is removed. No longer the internal decorate @outsource
    is used. related to `#31 <https://github.com/pyexcel/pyexcel/issues/31>`_
@@ -478,8 +515,7 @@ Removed:
 0.2.0 - 17.01.2016
 --------------------------------------------------------------------------------
 
-Updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated**
 
 #. adopt pyexcel-io yield key word to return generator as content
 #. pyexcel.save_as and pyexcel.save_book_as get performance improvements
@@ -487,24 +523,21 @@ Updated
 0.1.7 - 03.07.2015
 --------------------------------------------------------------------------------
 
-Added
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Added**
 
 #. Support pyramid-excel which does the database commit on its own.
 
 0.1.6 - 13.06.2015
 --------------------------------------------------------------------------------
 
-Added
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Added**
 
 #. get excel data from a http url
 
 0.0.13 - 07.02.2015
 --------------------------------------------------------------------------------
 
-Added
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Added**
 
 #. Support django
 #. texttable as default renderer
@@ -512,32 +545,28 @@ Added
 0.0.12 - 25.01.2015
 --------------------------------------------------------------------------------
 
-Added
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Added**
 
 #. Added sqlalchemy support
 
 0.0.10 - 15.12.2015
 --------------------------------------------------------------------------------
 
-Added
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Added**
 
 #. added csvz and tsvz format
 
 0.0.4 - 12.10.2014
 --------------------------------------------------------------------------------
 
-Updated
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Updated**
 
 #. Support python 3
 
 0.0.1 - 14.09.2014
 --------------------------------------------------------------------------------
 
-Features:
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+**Features:**
 
 #. read and write csv, ods, xls, xlsx and xlsm files(which are referred later as
    excel files)
diff --git a/CONTRIBUTORS.rst b/CONTRIBUTORS.rst
new file mode 100644
index 00000000..ec65ff63
--- /dev/null
+++ b/CONTRIBUTORS.rst
@@ -0,0 +1,25 @@
+
+
+18 contributors
+================================================================================
+
+In alphabetical order:
+
+* `Akshaya Kumar Sharma <https://github.com/akshayakrsh>`_
+* `Andre Almar <https://github.com/andrealmar>`_
+* `Arunkumar Rajendran <https://github.com/arunkumar-ra>`_
+* `Ayan Banerjee <https://github.com/ayan-b>`_
+* `Chris Hill-Scott <https://github.com/quis>`_
+* `Craig Anderson <https://github.com/craiga>`_
+* `Daryl Yu <https://github.com/darylyu>`_
+* `J Harley <https://github.com/julzhk>`_
+* `Joel Nothman <https://github.com/jnothman>`_
+* `John Vandenberg <https://github.com/jayvdb>`_
+* `Linghui Zeng <https://github.com/mathsyouth>`_
+* `nikolas <https://github.com/nikolas>`_
+* `Rintze M. Zelle <https://github.com/rmzelle>`_
+* `Simeon Visser <https://github.com/svisser>`_
+* `Simon Allen <https://github.com/garfunkel>`_
+* `simon klemenc <https://github.com/hiaselhans>`_
+* `Tim Gates <https://github.com/timgates42>`_
+* `William Jamir Silva <https://github.com/williamjamir>`_
diff --git a/LICENSE b/LICENSE
index 0799b43f..75e0035f 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2014-2019 by Onni Software Ltd. and its contributors
+Copyright (c) 2014-2020 by Onni Software Ltd. and its contributors
 All rights reserved.
 
 Redistribution and use in source and binary forms of the software as well
@@ -13,7 +13,7 @@ that the following conditions are met:
   and/or other materials provided with the distribution.
 
 * Neither the name of 'pyexcel' nor the names of the contributors
-  may be used to endorse or promote products derived from this software
+  may not be used to endorse or promote products derived from this software
   without specific prior written permission.
 
 THIS SOFTWARE AND DOCUMENTATION IS PROVIDED BY THE COPYRIGHT HOLDERS AND
diff --git a/MANIFEST.in b/MANIFEST.in
index 3f85769c..45e68635 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,6 +1,7 @@
 include README.rst
 include LICENSE
 include CHANGELOG.rst
+include CONTRIBUTORS.rst
 recursive-include tests *
 recursive-include docs *
 recursive-include examples *
diff --git a/Makefile b/Makefile
index 1e59cc21..3e0ee514 100644
--- a/Makefile
+++ b/Makefile
@@ -1,18 +1,16 @@
 all: test
 
-test:
+test: lint
 	bash test.sh
 
-doc:
-	bash document.sh
+install_test:
+	pip install -r tests/requirements.txt
 
-uml:
-	plantuml -tsvg -o ../_static/images/ docs/source/uml/*.uml
-
-format:
-	isort -y $(find pyexcel -name "*.py"|xargs echo) $(find tests -name "*.py"|xargs echo)
-	black -l 79 pyexcel
-	black -l 79 tests
-	black -l 79 setup.py
 lint:
 	bash lint.sh
+
+format:
+	bash format.sh
+
+git-diff-check:
+	git diff --exit-code
diff --git a/README.rst b/README.rst
index f0ec5a34..504d4b29 100644
--- a/README.rst
+++ b/README.rst
@@ -3,10 +3,10 @@ pyexcel - Let you focus on data, instead of file formats
 ================================================================================
 
 .. image:: https://raw.githubusercontent.com/pyexcel/pyexcel.github.io/master/images/patreon.png
-   :target: https://www.patreon.com/pyexcel
+   :target: https://www.patreon.com/chfw
 
-.. image:: https://api.bountysource.com/badge/team?team_id=288537
-   :target: https://salt.bountysource.com/teams/chfw-pyexcel
+.. image:: https://raw.githubusercontent.com/pyexcel/pyexcel-mobans/master/images/awesome-badge.svg
+   :target: https://awesome-python.com/#specific-formats-processing
 
 .. image:: https://travis-ci.org/pyexcel/pyexcel.svg?branch=master
    :target: http://travis-ci.org/pyexcel/pyexcel
@@ -14,9 +14,26 @@ pyexcel - Let you focus on data, instead of file formats
 .. image:: https://codecov.io/gh/pyexcel/pyexcel/branch/master/graph/badge.svg
    :target: https://codecov.io/gh/pyexcel/pyexcel
 
+.. image:: https://badge.fury.io/py/pyexcel.svg
+   :target: https://pypi.org/project/pyexcel
+
+.. image:: https://anaconda.org/conda-forge/pyexcel/badges/version.svg
+   :target: https://anaconda.org/conda-forge/pyexcel
+
+.. image:: https://pepy.tech/badge/pyexcel/month
+   :target: https://pepy.tech/project/pyexcel
+
+.. image:: https://anaconda.org/conda-forge/pyexcel/badges/downloads.svg
+   :target: https://anaconda.org/conda-forge/pyexcel
+
 .. image:: https://img.shields.io/gitter/room/gitterHQ/gitter.svg
    :target: https://gitter.im/pyexcel/Lobby
 
+.. image:: https://img.shields.io/static/v1?label=continuous%20templating&message=%E6%A8%A1%E7%89%88%E6%9B%B4%E6%96%B0&color=blue&style=flat-square
+    :target: https://moban.readthedocs.io/en/latest/#at-scale-continous-templating-for-open-source-projects
+
+.. image:: https://img.shields.io/static/v1?label=coding%20style&message=black&color=black&style=flat-square
+    :target: https://github.com/psf/black
 .. image:: https://readthedocs.org/projects/pyexcel/badge/?version=latest
    :target: http://pyexcel.readthedocs.org/en/latest/
 
@@ -24,7 +41,7 @@ Support the project
 ================================================================================
 
 If your company has embedded pyexcel and its components into a revenue generating
-product, please support me on `patreon <https://www.patreon.com/bePatron?u=5537627>`_
+product, please support me on github, `patreon <https://www.patreon.com/bePatron?u=5537627>`_
 or `bounty source <https://salt.bountysource.com/teams/chfw-pyexcel>`_ to maintain
 the project and develop it further.
 
@@ -43,12 +60,17 @@ Known constraints
 
 Fonts, colors and charts are not supported.
 
+Nor to read password protected xls, xlsx and ods files.
+
 Introduction
 ================================================================================
 
 Feature Highlights
 ===================
 
+.. image:: https://github.com/pyexcel/pyexcel/raw/dev/docs/source/_static/images/architecture.svg
+
+
 1. One application programming interface(API) to handle multiple data sources:
 
    * physical file
@@ -56,8 +78,9 @@ Feature Highlights
    * SQLAlchemy table
    * Django Model
    * Python data structures: dictionary, records and array
+
 2. One API to read and write data in various excel file formats.
-3. For large data sets, data streaming are supported. A genenerator can be returned to you. Checkout iget_records, iget_array, isave_as and isave_book_as. 
+3. For large data sets, data streaming are supported. A genenerator can be returned to you. Checkout iget_records, iget_array, isave_as and isave_book_as.
 
 
 
@@ -82,121 +105,898 @@ or clone it and install it:
 
 
 
-Usage
-===============
+One liners
+================================================================================
+
+This section shows you how to get data from your excel files and how to
+export data to excel files in **one line**
 
-Please note that you will have to use '.sortable.html' in order to replicate the example.
+Read from the excel files
+--------------------------------------------------------------------------------
 
-.. image:: https://github.com/pyexcel/pyexcel-sortable/raw/master/sortable.gif
+Get a list of dictionaries
+********************************************************************************
+
+
+Suppose you want to process the following coffee data (data source `coffee chart <https://cspinet.org/eating-healthy/ingredients-of-concern/caffeine-chart>`_ on the center for science in the public interest):
+
+
+Top 5 coffeine drinks:
+
+=====================================  ===============  =============
+Coffees                                Serving Size     Caffeine (mg)
+Starbucks Coffee Blonde Roast          venti(20 oz)     475
+Dunkin' Donuts Coffee with Turbo Shot  large(20 oz.)    398
+Starbucks Coffee Pike Place Roast      grande(16 oz.)   310
+Panera Coffee Light Roast              regular(16 oz.)  300
+=====================================  ===============  =============
+
+
+Let's get a list of dictionary out from the xls file:
 
 .. code-block:: python
 
-    >>> # pip install pyexcel-text==0.2.7.1
-    >>> import pyexcel as p
-    >>> ccs_insight2 = p.Sheet()
-    >>> ccs_insight2.name = "Worldwide Mobile Phone Shipments (Billions), 2017-2021"
-    >>> ccs_insight2.ndjson = """
-    ... {"year": ["2017", "2018", "2019", "2020", "2021"]}
-    ... {"smart phones": [1.53, 1.64, 1.74, 1.82, 1.90]}
-    ... {"feature phones": [0.46, 0.38, 0.30, 0.23, 0.17]}
-    ... """.strip()
-    >>> ccs_insight2
-    pyexcel sheet:
-    +----------------+------+------+------+------+------+
-    | year           | 2017 | 2018 | 2019 | 2020 | 2021 |
-    +----------------+------+------+------+------+------+
-    | smart phones   | 1.53 | 1.64 | 1.74 | 1.82 | 1.9  |
-    +----------------+------+------+------+------+------+
-    | feature phones | 0.46 | 0.38 | 0.3  | 0.23 | 0.17 |
-    +----------------+------+------+------+------+------+
+   >>> records = p.get_records(file_name="your_file.xls")
+
+And let's check what do we have:
 
+.. code-block:: python
 
+   >>> for r in records:
+   ...     print(f"{r['Serving Size']} of {r['Coffees']} has {r['Caffeine (mg)']} mg")
+   venti(20 oz) of Starbucks Coffee Blonde Roast has 475 mg
+   large(20 oz.) of Dunkin' Donuts Coffee with Turbo Shot has 398 mg
+   grande(16 oz.) of Starbucks Coffee Pike Place Roast has 310 mg
+   regular(16 oz.) of Panera Coffee Light Roast has 300 mg
 
-Suppose you have the following data in a dictionary:
 
-========= ====
-Name      Age
-========= ====
-Adam      28
-Beatrice  29
-Ceri      30
-Dean      26
-========= ====
+Get two dimensional array
+********************************************************************************
 
-you can easily save it into an excel file using the following code:
+Instead, what if you have to use `pyexcel.get_array` to do the same:
 
 .. code-block:: python
 
-   >>> import pyexcel
-   >>> # make sure you had pyexcel-xls installed
-   >>> a_list_of_dictionaries = [
-   ...     {
-   ...         "Name": 'Adam',
-   ...         "Age": 28
-   ...     },
-   ...     {
-   ...         "Name": 'Beatrice',
-   ...         "Age": 29
-   ...     },
-   ...     {
-   ...         "Name": 'Ceri',
-   ...         "Age": 30
-   ...     },
-   ...     {
-   ...         "Name": 'Dean',
-   ...         "Age": 26
-   ...     }
+   >>> for row in p.get_array(file_name="your_file.xls", start_row=1):
+   ...     print(f"{row[1]} of {row[0]} has {row[2]} mg")
+   venti(20 oz) of Starbucks Coffee Blonde Roast has 475 mg
+   large(20 oz.) of Dunkin' Donuts Coffee with Turbo Shot has 398 mg
+   grande(16 oz.) of Starbucks Coffee Pike Place Roast has 310 mg
+   regular(16 oz.) of Panera Coffee Light Roast has 300 mg
+
+
+where `start_row` skips the header row.
+
+
+Get a dictionary
+********************************************************************************
+
+You can get a dictionary too:
+
+Now let's get a dictionary out from the spreadsheet:
+
+.. code-block:: python
+
+   >>> my_dict = p.get_dict(file_name="your_file.xls", name_columns_by_row=0)
+
+And check what do we have:
+
+.. code-block:: python
+
+   >>> from pyexcel._compact import OrderedDict
+   >>> isinstance(my_dict, OrderedDict)
+   True
+   >>> for key, values in my_dict.items():
+   ...     print(key + " : " + ','.join([str(item) for item in values]))
+   Coffees : Starbucks Coffee Blonde Roast,Dunkin' Donuts Coffee with Turbo Shot,Starbucks Coffee Pike Place Roast,Panera Coffee Light Roast
+   Serving Size : venti(20 oz),large(20 oz.),grande(16 oz.),regular(16 oz.)
+   Caffeine (mg) : 475,398,310,300
+
+Please note that my_dict is an OrderedDict.
+
+Get a dictionary of two dimensional array
+********************************************************************************
+
+
+Suppose you have a multiple sheet book as the following:
+
+
+pyexcel:Sheet 1:
+
+=====================  =  =
+1                      2  3
+4                      5  6
+7                      8  9
+=====================  =  =
+
+pyexcel:Sheet 2:
+
+=====================  =  =
+X                      Y  Z
+1                      2  3
+4                      5  6
+=====================  =  =
+
+pyexcel:Sheet 3:
+
+=====================  =  =
+O                      P  Q
+3                      2  1
+4                      3  2
+=====================  =  =
+
+
+Here is the code to obtain those sheets as a single dictionary:
+
+.. code-block:: python
+
+   >>> book_dict = p.get_book_dict(file_name="book.xls")
+
+And check:
+
+.. code-block:: python
+
+   >>> isinstance(book_dict, OrderedDict)
+   True
+   >>> import json
+   >>> for key, item in book_dict.items():
+   ...     print(json.dumps({key: item}))
+   {"Sheet 1": [[1, 2, 3], [4, 5, 6], [7, 8, 9]]}
+   {"Sheet 2": [["X", "Y", "Z"], [1, 2, 3], [4, 5, 6]]}
+   {"Sheet 3": [["O", "P", "Q"], [3, 2, 1], [4, 3, 2]]}
+
+
+Write data
+---------------------------------------------
+
+Export an array
+**********************
+
+Suppose you have the following array:
+
+.. code-block:: python
+
+   >>> data = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
+
+And here is the code to save it as an excel file :
+
+.. code-block:: python
+
+   >>> p.save_as(array=data, dest_file_name="example.xls")
+
+Let's verify it:
+
+.. code-block:: python
+
+    >>> p.get_sheet(file_name="example.xls")
+    pyexcel_sheet1:
+    +---+---+---+
+    | 1 | 2 | 3 |
+    +---+---+---+
+    | 4 | 5 | 6 |
+    +---+---+---+
+    | 7 | 8 | 9 |
+    +---+---+---+
+
+
+And here is the code to save it as a csv file :
+
+.. code-block:: python
+
+   >>> p.save_as(array=data,
+   ...           dest_file_name="example.csv",
+   ...           dest_delimiter=':')
+
+Let's verify it:
+
+.. code-block:: python
+
+   >>> with open("example.csv") as f:
+   ...     for line in f.readlines():
+   ...         print(line.rstrip())
+   ...
+   1:2:3
+   4:5:6
+   7:8:9
+
+Export a list of dictionaries
+**********************************
+
+.. code-block:: python
+
+    >>> records = [
+    ...     {"year": 1903, "country": "Germany", "speed": "206.7km/h"},
+    ...     {"year": 1964, "country": "Japan", "speed": "210km/h"},
+    ...     {"year": 2008, "country": "China", "speed": "350km/h"}
+    ... ]
+    >>> p.save_as(records=records, dest_file_name='high_speed_rail.xls')
+
+
+Export a dictionary of single key value pair
+********************************************************************************
+
+.. code-block:: python
+
+    >>> henley_on_thames_facts = {
+    ...     "area": "5.58 square meters",
+    ...     "population": "11,619",
+    ...     "civial parish": "Henley-on-Thames",
+    ...     "latitude": "51.536",
+    ...     "longitude": "-0.898"
+    ... }
+    >>> p.save_as(adict=henley_on_thames_facts, dest_file_name='henley.xlsx')
+
+
+Export a dictionary of single dimensonal array
+********************************************************************************
+
+.. code-block:: python
+
+    >>> ccs_insights = {
+    ...     "year": ["2017", "2018", "2019", "2020", "2021"],
+    ...     "smart phones": [1.53, 1.64, 1.74, 1.82, 1.90],
+    ...     "feature phones": [0.46, 0.38, 0.30, 0.23, 0.17]
+    ... }
+    >>> p.save_as(adict=ccs_insights, dest_file_name='ccs.csv')
+
+
+Export a dictionary of two dimensional array as a book
+********************************************************************************
+
+Suppose you want to save the below dictionary to an excel file :
+
+.. code-block:: python
+
+   >>> a_dictionary_of_two_dimensional_arrays = {
+   ...      'Sheet 1':
+   ...          [
+   ...              [1.0, 2.0, 3.0],
+   ...              [4.0, 5.0, 6.0],
+   ...              [7.0, 8.0, 9.0]
+   ...          ],
+   ...      'Sheet 2':
+   ...          [
+   ...              ['X', 'Y', 'Z'],
+   ...              [1.0, 2.0, 3.0],
+   ...              [4.0, 5.0, 6.0]
+   ...          ],
+   ...      'Sheet 3':
+   ...          [
+   ...              ['O', 'P', 'Q'],
+   ...              [3.0, 2.0, 1.0],
+   ...              [4.0, 3.0, 2.0]
+   ...          ]
+   ...  }
+
+Here is the code:
+
+.. code-block:: python
+
+   >>> p.save_book_as(
+   ...    bookdict=a_dictionary_of_two_dimensional_arrays,
+   ...    dest_file_name="book.xls"
+   ... )
+
+If you want to preserve the order of sheets in your dictionary, you have to
+pass on an ordered dictionary to the function itself. For example:
+
+.. code-block:: python
+
+   >>> data = OrderedDict()
+   >>> data.update({"Sheet 2": a_dictionary_of_two_dimensional_arrays['Sheet 2']})
+   >>> data.update({"Sheet 1": a_dictionary_of_two_dimensional_arrays['Sheet 1']})
+   >>> data.update({"Sheet 3": a_dictionary_of_two_dimensional_arrays['Sheet 3']})
+   >>> p.save_book_as(bookdict=data, dest_file_name="book.xls")
+
+Let's verify its order:
+
+.. code-block:: python
+
+   >>> book_dict = p.get_book_dict(file_name="book.xls")
+   >>> for key, item in book_dict.items():
+   ...     print(json.dumps({key: item}))
+   {"Sheet 2": [["X", "Y", "Z"], [1, 2, 3], [4, 5, 6]]}
+   {"Sheet 1": [[1, 2, 3], [4, 5, 6], [7, 8, 9]]}
+   {"Sheet 3": [["O", "P", "Q"], [3, 2, 1], [4, 3, 2]]}
+
+Please notice that "Sheet 2" is the first item in the *book_dict*, meaning the order of sheets are preserved.
+
+
+Transcoding
+-------------------------------------------
+
+.. note::
+
+   Please note that `pyexcel-cli` can perform file transcoding at command line.
+   No need to open your editor, save the problem, then python run.
+
+
+The following code does a simple file format transcoding from xls to csv:
+
+.. code-block:: python
+
+   >>> p.save_as(file_name="birth.xls", dest_file_name="birth.csv")
+
+Again it is really simple. Let's verify what we have gotten:
+
+.. code-block:: python
+
+   >>> sheet = p.get_sheet(file_name="birth.csv")
+   >>> sheet
+   birth.csv:
+   +-------+--------+----------+
+   | name  | weight | birth    |
+   +-------+--------+----------+
+   | Adam  | 3.4    | 03/02/15 |
+   +-------+--------+----------+
+   | Smith | 4.2    | 12/11/14 |
+   +-------+--------+----------+
+
+.. NOTE::
+
+   Please note that csv(comma separate value) file is pure text file. Formula, charts, images and formatting in xls file will disappear no matter which transcoding tool you use. Hence, pyexcel is a quick alternative for this transcoding job.
+
+
+Let use previous example and save it as xlsx instead
+
+.. code-block:: python
+
+   >>> p.save_as(file_name="birth.xls",
+   ...           dest_file_name="birth.xlsx") # change the file extension
+
+Again let's verify what we have gotten:
+
+.. code-block:: python
+
+   >>> sheet = p.get_sheet(file_name="birth.xlsx")
+   >>> sheet
+   pyexcel_sheet1:
+   +-------+--------+----------+
+   | name  | weight | birth    |
+   +-------+--------+----------+
+   | Adam  | 3.4    | 03/02/15 |
+   +-------+--------+----------+
+   | Smith | 4.2    | 12/11/14 |
+   +-------+--------+----------+
+
+
+Excel book merge and split operation in one line
+--------------------------------------------------------------------------------
+
+Merge all excel files in directory into  a book where each file become a sheet
+********************************************************************************
+
+The following code will merge every excel files into one file, say "output.xls":
+
+.. code-block:: python
+
+    from pyexcel.cookbook import merge_all_to_a_book
+    import glob
+
+
+    merge_all_to_a_book(glob.glob("your_csv_directory\*.csv"), "output.xls")
+
+You can mix and match with other excel formats: xls, xlsm and ods. For example, if you are sure you have only xls, xlsm, xlsx, ods and csv files in `your_excel_file_directory`, you can do the following:
+
+.. code-block:: python
+
+    from pyexcel.cookbook import merge_all_to_a_book
+    import glob
+
+
+    merge_all_to_a_book(glob.glob("your_excel_file_directory\*.*"), "output.xls")
+
+Split a book into single sheet files
+****************************************
+
+
+Suppose you have many sheets in a work book and you would like to separate each into a single sheet excel file. You can easily do this:
+
+.. code-block:: python
+
+   >>> from pyexcel.cookbook import split_a_book
+   >>> split_a_book("megabook.xls", "output.xls")
+   >>> import glob
+   >>> outputfiles = glob.glob("*_output.xls")
+   >>> for file in sorted(outputfiles):
+   ...     print(file)
+   ...
+   Sheet 1_output.xls
+   Sheet 2_output.xls
+   Sheet 3_output.xls
+
+for the output file, you can specify any of the supported formats
+
+
+Extract just one sheet from a book
+*************************************
+
+
+Suppose you just want to extract one sheet from many sheets that exists in a work book and you would like to separate it into a single sheet excel file. You can easily do this:
+
+.. code-block:: python
+
+    >>> from pyexcel.cookbook import extract_a_sheet_from_a_book
+    >>> extract_a_sheet_from_a_book("megabook.xls", "Sheet 1", "output.xls")
+    >>> if os.path.exists("Sheet 1_output.xls"):
+    ...     print("Sheet 1_output.xls exists")
+    ...
+    Sheet 1_output.xls exists
+
+for the output file, you can specify any of the supported formats
+
+
+Hidden feature: partial read
+===============================================
+
+Most pyexcel users do not know, but other library users were requesting `the similar features <https://github.com/jazzband/tablib/issues/467>`_
+
+
+When you are dealing with huge amount of data, e.g. 64GB, obviously you would not
+like to fill up your memory with those data. What you may want to do is, record
+data from Nth line, take M records and stop. And you only want to use your memory
+for the M records, not for beginning part nor for the tail part.
+
+Hence partial read feature is developed to read partial data into memory for
+processing. 
+
+You can paginate by row, by column and by both, hence you dictate what portion of the
+data to read back. But remember only row limit features help you save memory. Let's
+you use this feature to record data from Nth column, take M number of columns and skip
+the rest. You are not going to reduce your memory footprint.
+
+Why did not I see above benefit?
+--------------------------------------------------------------------------------
+
+This feature depends heavily on the implementation details.
+
+`pyexcel-xls`_ (xlrd), `pyexcel-xlsx`_ (openpyxl), `pyexcel-ods`_ (odfpy) and
+`pyexcel-ods3`_ (pyexcel-ezodf) will read all data into memory. Because xls,
+xlsx and ods file are effective a zipped folder, all four will unzip the folder
+and read the content in xml format in **full**, so as to make sense of all details.
+
+Hence, during the partial data is been returned, the memory consumption won't
+differ from reading the whole data back. Only after the partial
+data is returned, the memory comsumption curve shall jump the cliff. So pagination
+code here only limits the data returned to your program.
+
+With that said, `pyexcel-xlsxr`_, `pyexcel-odsr`_ and `pyexcel-htmlr`_ DOES read
+partial data into memory. Those three are implemented in such a way that they
+consume the xml(html) when needed. When they have read designated portion of the
+data, they stop, even if they are half way through.
+
+In addition, pyexcel's csv readers can read partial data into memory too.
+
+
+Let's assume the following file is a huge csv file:
+
+.. code-block:: python
+
+   >>> import datetime
+   >>> import pyexcel as pe
+   >>> data = [
+   ...     [1, 21, 31],
+   ...     [2, 22, 32],
+   ...     [3, 23, 33],
+   ...     [4, 24, 34],
+   ...     [5, 25, 35],
+   ...     [6, 26, 36]
    ... ]
-   >>> pyexcel.save_as(records=a_list_of_dictionaries, dest_file_name="your_file.xls")
+   >>> pe.save_as(array=data, dest_file_name="your_file.csv")
+
+
+And let's pretend to read partial data:
+
+
+.. code-block:: python
+
+   >>> pe.get_sheet(file_name="your_file.csv", start_row=2, row_limit=3)
+   your_file.csv:
+   +---+----+----+
+   | 3 | 23 | 33 |
+   +---+----+----+
+   | 4 | 24 | 34 |
+   +---+----+----+
+   | 5 | 25 | 35 |
+   +---+----+----+
+
+And you could as well do the same for columns:
+
+.. code-block:: python
+
+   >>> pe.get_sheet(file_name="your_file.csv", start_column=1, column_limit=2)
+   your_file.csv:
+   +----+----+
+   | 21 | 31 |
+   +----+----+
+   | 22 | 32 |
+   +----+----+
+   | 23 | 33 |
+   +----+----+
+   | 24 | 34 |
+   +----+----+
+   | 25 | 35 |
+   +----+----+
+   | 26 | 36 |
+   +----+----+
+
+Obvious, you could do both at the same time:
+
+.. code-block:: python
+
+   >>> pe.get_sheet(file_name="your_file.csv",
+   ...     start_row=2, row_limit=3,
+   ...     start_column=1, column_limit=2)
+   your_file.csv:
+   +----+----+
+   | 23 | 33 |
+   +----+----+
+   | 24 | 34 |
+   +----+----+
+   | 25 | 35 |
+   +----+----+
+
+
+The pagination support is available across all pyexcel plugins.
+
+.. note::
+
+   No column pagination support for query sets as data source. 
+
+
+Formatting while transcoding a big data file
+--------------------------------------------------------------------------------
+
+If you are transcoding a big data set, conventional formatting method would not
+help unless a on-demand free RAM is available. However, there is a way to minimize
+the memory footprint of pyexcel while the formatting is performed.
+
+Let's continue from previous example. Suppose we want to transcode "your_file.csv"
+to "your_file.xls" but increase each element by 1.
 
+What we can do is to define a row renderer function as the following:
 
-And here's how to obtain the records:
+.. code-block:: python
+
+   >>> def increment_by_one(row):
+   ...     for element in row:
+   ...         yield element + 1
+
+Then pass it onto save_as function using row_renderer:
 
 .. code-block:: python
+
+   >>> pe.isave_as(file_name="your_file.csv",
+   ...             row_renderer=increment_by_one,
+   ...             dest_file_name="your_file.xlsx")
+
+
+.. note::
+
+   If the data content is from a generator, isave_as has to be used.
    
-   >>> import pyexcel as p
+We can verify if it was done correctly:
+
+.. code-block:: python
+
+   >>> pe.get_sheet(file_name="your_file.xlsx")
+   your_file.csv:
+   +---+----+----+
+   | 2 | 22 | 32 |
+   +---+----+----+
+   | 3 | 23 | 33 |
+   +---+----+----+
+   | 4 | 24 | 34 |
+   +---+----+----+
+   | 5 | 25 | 35 |
+   +---+----+----+
+   | 6 | 26 | 36 |
+   +---+----+----+
+   | 7 | 27 | 37 |
+   +---+----+----+
+
+
+Stream APIs for big file : A set of two liners
+================================================================================
+
+When you are dealing with **BIG** excel files, you will want **pyexcel** to use
+constant memory.
+
+This section shows you how to get data from your **BIG** excel files and how to
+export data to excel files in **two lines** at most, without eating all
+your computer memory.
+
+
+Two liners for get data from big excel files
+--------------------------------------------------------------------------------
+
+Get a list of dictionaries
+********************************************************************************
+
+
+
+Suppose you want to process the following coffee data again:
+
+Top 5 coffeine drinks:
+
+=====================================  ===============  =============
+Coffees                                Serving Size     Caffeine (mg)
+Starbucks Coffee Blonde Roast          venti(20 oz)     475
+Dunkin' Donuts Coffee with Turbo Shot  large(20 oz.)    398
+Starbucks Coffee Pike Place Roast      grande(16 oz.)   310
+Panera Coffee Light Roast              regular(16 oz.)  300
+=====================================  ===============  =============
+
+
+Let's get a list of dictionary out from the xls file:
+
+.. code-block:: python
+
    >>> records = p.iget_records(file_name="your_file.xls")
-   >>> for record in records:
-   ...     print("%s is aged at %d" % (record['Name'], record['Age']))
-   Adam is aged at 28
-   Beatrice is aged at 29
-   Ceri is aged at 30
-   Dean is aged at 26
+
+And let's check what do we have:
+
+.. code-block:: python
+
+   >>> for r in records:
+   ...     print(f"{r['Serving Size']} of {r['Coffees']} has {r['Caffeine (mg)']} mg")
+   venti(20 oz) of Starbucks Coffee Blonde Roast has 475 mg
+   large(20 oz.) of Dunkin' Donuts Coffee with Turbo Shot has 398 mg
+   grande(16 oz.) of Starbucks Coffee Pike Place Roast has 310 mg
+   regular(16 oz.) of Panera Coffee Light Roast has 300 mg
+
+Please do not forgot the second line to close the opened file handle:
+
+.. code-block:: python
+
    >>> p.free_resources()
 
+Get two dimensional array
+********************************************************************************
 
-Advanced usage :fire:
-----------------------
+Instead, what if you have to use `pyexcel.get_array` to do the same:
 
-If you are dealing with big data, please consider these usages:
+.. code-block:: python
+
+   >>> for row in p.iget_array(file_name="your_file.xls", start_row=1):
+   ...     print(f"{row[1]} of {row[0]} has {row[2]} mg")
+   venti(20 oz) of Starbucks Coffee Blonde Roast has 475 mg
+   large(20 oz.) of Dunkin' Donuts Coffee with Turbo Shot has 398 mg
+   grande(16 oz.) of Starbucks Coffee Pike Place Roast has 310 mg
+   regular(16 oz.) of Panera Coffee Light Roast has 300 mg
+
+Again, do not forgot the second line:
+
+.. code-block:: python
+
+   >>> p.free_resources()
+
+where `start_row` skips the header row.
+
+Data export in one liners
+---------------------------------------------
+
+Export an array
+**********************
+
+Suppose you have the following array:
+
+.. code-block:: python
+
+   >>> data = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
+
+And here is the code to save it as an excel file :
+
+.. code-block:: python
+
+   >>> p.isave_as(array=data, dest_file_name="example.xls")
+
+But the following line is not required because the data source
+are not file sources:
+
+.. code-block:: python
+
+   >>> # p.free_resources()
+
+Let's verify it:
+
+.. code-block:: python
+
+    >>> p.get_sheet(file_name="example.xls")
+    pyexcel_sheet1:
+    +---+---+---+
+    | 1 | 2 | 3 |
+    +---+---+---+
+    | 4 | 5 | 6 |
+    +---+---+---+
+    | 7 | 8 | 9 |
+    +---+---+---+
+
+
+And here is the code to save it as a csv file :
+
+.. code-block:: python
+
+   >>> p.isave_as(array=data,
+   ...            dest_file_name="example.csv",
+   ...            dest_delimiter=':')
+
+Let's verify it:
+
+.. code-block:: python
+
+   >>> with open("example.csv") as f:
+   ...     for line in f.readlines():
+   ...         print(line.rstrip())
+   ...
+   1:2:3
+   4:5:6
+   7:8:9
+
+Export a list of dictionaries
+**********************************
+
+.. code-block:: python
+
+    >>> records = [
+    ...     {"year": 1903, "country": "Germany", "speed": "206.7km/h"},
+    ...     {"year": 1964, "country": "Japan", "speed": "210km/h"},
+    ...     {"year": 2008, "country": "China", "speed": "350km/h"}
+    ... ]
+    >>> p.isave_as(records=records, dest_file_name='high_speed_rail.xls')
+
+Export a dictionary of single key value pair
+********************************************************************************
+
+.. code-block:: python
+
+    >>> henley_on_thames_facts = {
+    ...     "area": "5.58 square meters",
+    ...     "population": "11,619",
+    ...     "civial parish": "Henley-on-Thames",
+    ...     "latitude": "51.536",
+    ...     "longitude": "-0.898"
+    ... }
+    >>> p.isave_as(adict=henley_on_thames_facts, dest_file_name='henley.xlsx')
+
+Export a dictionary of single dimensonal array
+********************************************************************************
+
+.. code-block:: python
+
+    >>> ccs_insights = {
+    ...     "year": ["2017", "2018", "2019", "2020", "2021"],
+    ...     "smart phones": [1.53, 1.64, 1.74, 1.82, 1.90],
+    ...     "feature phones": [0.46, 0.38, 0.30, 0.23, 0.17]
+    ... }
+    >>> p.isave_as(adict=ccs_insights, dest_file_name='ccs.csv')
+    >>> p.free_resources()
+
+Export a dictionary of two dimensional array as a book
+********************************************************************************
+
+Suppose you want to save the below dictionary to an excel file :
+
+.. code-block:: python
+
+   >>> a_dictionary_of_two_dimensional_arrays = {
+   ...      'Sheet 1':
+   ...          [
+   ...              [1.0, 2.0, 3.0],
+   ...              [4.0, 5.0, 6.0],
+   ...              [7.0, 8.0, 9.0]
+   ...          ],
+   ...      'Sheet 2':
+   ...          [
+   ...              ['X', 'Y', 'Z'],
+   ...              [1.0, 2.0, 3.0],
+   ...              [4.0, 5.0, 6.0]
+   ...          ],
+   ...      'Sheet 3':
+   ...          [
+   ...              ['O', 'P', 'Q'],
+   ...              [3.0, 2.0, 1.0],
+   ...              [4.0, 3.0, 2.0]
+   ...          ]
+   ...  }
+
+Here is the code:
+
+.. code-block:: python
+
+   >>> p.isave_book_as(
+   ...    bookdict=a_dictionary_of_two_dimensional_arrays,
+   ...    dest_file_name="book.xls"
+   ... )
+
+If you want to preserve the order of sheets in your dictionary, you have to
+pass on an ordered dictionary to the function itself. For example:
+
+.. code-block:: python
+
+   >>> from pyexcel._compact import OrderedDict
+   >>> data = OrderedDict()
+   >>> data.update({"Sheet 2": a_dictionary_of_two_dimensional_arrays['Sheet 2']})
+   >>> data.update({"Sheet 1": a_dictionary_of_two_dimensional_arrays['Sheet 1']})
+   >>> data.update({"Sheet 3": a_dictionary_of_two_dimensional_arrays['Sheet 3']})
+   >>> p.isave_book_as(bookdict=data, dest_file_name="book.xls")
+   >>> p.free_resources()
+
+Let's verify its order:
+
+.. code-block:: python
+
+   >>> import json
+   >>> book_dict = p.get_book_dict(file_name="book.xls")
+   >>> for key, item in book_dict.items():
+   ...     print(json.dumps({key: item}))
+   {"Sheet 2": [["X", "Y", "Z"], [1, 2, 3], [4, 5, 6]]}
+   {"Sheet 1": [[1, 2, 3], [4, 5, 6], [7, 8, 9]]}
+   {"Sheet 3": [["O", "P", "Q"], [3, 2, 1], [4, 3, 2]]}
+
+Please notice that "Sheet 2" is the first item in the *book_dict*, meaning the order of sheets are preserved.
+
+
+File format transcoding on one line
+-------------------------------------------
+
+.. note::
+
+   Please note that the following file transcoding could be with zero line. Please
+   install pyexcel-cli and you will do the transcode in one command. No need to
+   open your editor, save the problem, then python run.
+
+
+The following code does a simple file format transcoding from xls to csv:
+
+.. code-block:: python
+
+   >>> import pyexcel
+   >>> p.save_as(file_name="birth.xls", dest_file_name="birth.csv")
+
+Again it is really simple. Let's verify what we have gotten:
+
+.. code-block:: python
+
+   >>> sheet = p.get_sheet(file_name="birth.csv")
+   >>> sheet
+   birth.csv:
+   +-------+--------+----------+
+   | name  | weight | birth    |
+   +-------+--------+----------+
+   | Adam  | 3.4    | 03/02/15 |
+   +-------+--------+----------+
+   | Smith | 4.2    | 12/11/14 |
+   +-------+--------+----------+
+
+.. note::
+
+   Please note that csv(comma separate value) file is pure text file. Formula, charts, images and formatting in xls file will disappear no matter which transcoding tool you use. Hence, pyexcel is a quick alternative for this transcoding job.
+
+
+Let use previous example and save it as xlsx instead
+
+.. code-block:: python
+
+   >>> import pyexcel
+   >>> p.isave_as(file_name="birth.xls",
+   ...            dest_file_name="birth.xlsx") # change the file extension
+
+Again let's verify what we have gotten:
+
+.. code-block:: python
+
+   >>> sheet = p.get_sheet(file_name="birth.xlsx")
+   >>> sheet
+   pyexcel_sheet1:
+   +-------+--------+----------+
+   | name  | weight | birth    |
+   +-------+--------+----------+
+   | Adam  | 3.4    | 03/02/15 |
+   +-------+--------+----------+
+   | Smith | 4.2    | 12/11/14 |
+   +-------+--------+----------+
 
-   >>> def increase_everyones_age(generator):
-   ...     for row in generator:
-   ...         row['Age'] += 1
-   ...         yield row
-   >>> def duplicate_each_record(generator):
-   ...     for row in generator:
-   ...         yield row
-   ...         yield row
-   >>> records = p.iget_records(file_name="your_file.xls")
-   >>> io=p.isave_as(records=duplicate_each_record(increase_everyones_age(records)),
-   ...     dest_file_type='csv', dest_lineterminator='\n')
-   >>> print(io.getvalue())
-   Age,Name
-   29,Adam
-   29,Adam
-   30,Beatrice
-   30,Beatrice
-   31,Ceri
-   31,Ceri
-   27,Dean
-   27,Dean
-   <BLANKLINE>
-
-Two advantages of above method:
-
-#. Add as many wrapping functions as you want.
-#. Constant memory consumption
 
 Available Plugins
 =================
@@ -206,33 +1006,56 @@ Available Plugins
 
 .. table:: A list of file formats supported by external plugins
 
-   ======================== ======================= ================= ==================
-   Package name              Supported file formats  Dependencies     Python versions
-   ======================== ======================= ================= ==================
-   `pyexcel-io`_            csv, csvz [#f1]_, tsv,                    2.6, 2.7, 3.3,
-                            tsvz [#f2]_                               3.4, 3.5, 3.6
-                                                                      pypy
-   `pyexcel-xls`_           xls, xlsx(read only),   `xlrd`_,          same as above
+   ======================== ======================= =================
+   Package name              Supported file formats  Dependencies
+   ======================== ======================= =================
+   `pyexcel-io`_            csv, csvz [#f1]_, tsv,
+                            tsvz [#f2]_
+   `pyexcel-xls`_           xls, xlsx(read only),   `xlrd`_,
                             xlsm(read only)         `xlwt`_
-   `pyexcel-xlsx`_          xlsx                    `openpyxl`_       same as above
-   `pyexcel-ods3`_          ods                     `pyexcel-ezodf`_, 2.6, 2.7, 3.3, 3.4
-                                                    lxml              3.5, 3.6
-   `pyexcel-ods`_           ods                     `odfpy`_          same as above
-   ======================== ======================= ================= ==================
+   `pyexcel-xlsx`_          xlsx                    `openpyxl`_
+   `pyexcel-ods3`_          ods                     `pyexcel-ezodf`_,
+                                                    lxml
+   `pyexcel-ods`_           ods                     `odfpy`_
+   ======================== ======================= =================
 
 .. table:: Dedicated file reader and writers
 
-   ======================== ======================= ================= ==================
-   Package name              Supported file formats  Dependencies     Python versions
-   ======================== ======================= ================= ==================
-   `pyexcel-xlsxw`_         xlsx(write only)        `XlsxWriter`_     Python 2 and 3
-   `pyexcel-xlsxr`_         xlsx(read only)         lxml              same as above
-   `pyexcel-xlsbr`_         xlsx(read only)         pyxlsb            same as above
-   `pyexcel-odsr`_          read only for ods, fods lxml              same as above
-   `pyexcel-odsw`_          write only for ods      loxun             same as above
-   `pyexcel-htmlr`_         html(read only)         lxml,html5lib     same as above
-   `pyexcel-pdfr`_          pdf(read only)          pdftables         Python 2 only.
-   ======================== ======================= ================= ==================
+   ======================== ======================= =================
+   Package name              Supported file formats  Dependencies
+   ======================== ======================= =================
+   `pyexcel-xlsxw`_         xlsx(write only)        `XlsxWriter`_
+   `pyexcel-libxlsxw`_      xlsx(write only)        `libxlsxwriter`_
+   `pyexcel-xlsxr`_         xlsx(read only)         lxml
+   `pyexcel-xlsbr`_         xlsb(read only)         pyxlsb
+   `pyexcel-odsr`_          read only for ods, fods lxml
+   `pyexcel-odsw`_          write only for ods      loxun
+   `pyexcel-htmlr`_         html(read only)         lxml,html5lib
+   `pyexcel-pdfr`_          pdf(read only)          camelot
+   ======================== ======================= =================
+
+
+Plugin shopping guide
+------------------------
+
+Since 2020, all pyexcel-io plugins have dropped the support for python version
+lower than 3.6. If you want to use any python verions, please use pyexcel-io
+and its plugins version lower than 0.6.0.
+
+
+Except csv files, xls, xlsx and ods files are a zip of a folder containing a lot of
+xml files
+
+The dedicated readers for excel files can stream read
+
+
+In order to manage the list of plugins installed, you need to use pip to add or remove
+a plugin. When you use virtualenv, you can have different plugins per virtual
+environment. In the situation where you have multiple plugins that does the same thing
+in your environment, you need to tell pyexcel which plugin to use per function call.
+For example, pyexcel-ods and pyexcel-odsr, and you want to get_array to use pyexcel-odsr.
+You need to append get_array(..., library='pyexcel-odsr').
+
 
 
 .. _pyexcel-io: https://github.com/pyexcel/pyexcel-io
@@ -245,6 +1068,7 @@ Available Plugins
 .. _pyexcel-pdfr: https://github.com/pyexcel/pyexcel-pdfr
 
 .. _pyexcel-xlsxw: https://github.com/pyexcel/pyexcel-xlsxw
+.. _pyexcel-libxlsxw: https://github.com/pyexcel/pyexcel-libxlsxw
 .. _pyexcel-xlsxr: https://github.com/pyexcel/pyexcel-xlsxr
 .. _pyexcel-xlsbr: https://github.com/pyexcel/pyexcel-xlsbr
 .. _pyexcel-htmlr: https://github.com/pyexcel/pyexcel-htmlr
@@ -255,6 +1079,7 @@ Available Plugins
 .. _XlsxWriter: https://github.com/jmcnamara/XlsxWriter
 .. _pyexcel-ezodf: https://github.com/pyexcel/pyexcel-ezodf
 .. _odfpy: https://github.com/eea/odfpy
+.. _libxlsxwriter: http://libxlsxwriter.github.io/getting_started.html
 
 .. table:: Other data renderers
 
@@ -288,13 +1113,6 @@ Available Plugins
 .. _pyexcel-gantt: https://github.com/pyexcel/pyexcel-gantt
 .. _frappe-gantt: https://github.com/frappe/gantt
 
-In order to manage the list of plugins installed, you need to use pip to add or remove
-a plugin. When you use virtualenv, you can have different plugins per virtual
-environment. In the situation where you have multiple plugins that does the same thing
-in your environment, you need to tell pyexcel which plugin to use per function call.
-For example, pyexcel-ods and pyexcel-odsr, and you want to get_array to use pyexcel-odsr.
-You need to append get_array(..., library='pyexcel-odsr').
-
 .. rubric:: Footnotes
 
 .. [#f1] zipped csv file
@@ -308,12 +1126,6 @@ All great work have been done by odf, ezodf, xlrd, xlwt, tabulate and other
 individual developers. This library unites only the data access code.
 
 
-.. testcode::
-   :hide:
-   
-   >>> import os
-   >>> os.unlink("your_file.xls")
-
 
 
 License
diff --git a/changelog.yml b/changelog.yml
index 38a4abe9..285842b0 100644
--- a/changelog.yml
+++ b/changelog.yml
@@ -1,6 +1,62 @@
 name: pyexcel
 organisation: pyexcel
 releases:
+- changes:
+  - action: Updated
+    details:
+    - "`#233`: dynamically resize the table matrix on set_value. sheet['AA1'] = 'test' will work in this release."
+  version: 0.6.6
+  date: 14.11.2020
+- changes:
+  - action: Updated
+    details:
+    - "update queryset source to work with pyexcel-io 0.6.0"
+  version: 0.6.5
+  date: 8.10.2020
+- changes:
+  - action: Updated
+    details:
+    - "`#219`: book created from dict no longer discards order."
+  version: 0.6.4
+  date: 18.08.2020
+- changes:
+  - action: fixed
+    details:
+    - "`#214`: remove leading and trailing whitespace for column names"
+  - action: removed
+    details:
+    - python 2 compatibility have been permanently removed.
+  version: 0.6.3
+  date: 01.08.2020
+- changes:
+  - action: fixed
+    details:
+    - "`#109`: Control the column order when write the data output"
+  version: 0.6.2
+  date: 8.06.2020
+- changes:
+  - action: fixed
+    details:
+    - "`#203`: texttable was dropped out in 0.6.0 as compulsary dependency. end user may experience it when a sheet/table is printed in a shell. otherwise, new user of pyexcel won't see it. As of release date, no issues were created"
+  version: 0.6.1
+  date: 02.05.2020
+- changes:
+  - action: updated
+    details:
+    - "`#199`: += in place; = + shall return new instance"
+    - "`#195`: documentation update. however small is welcome"
+  - action: removed
+    details:
+    - "Dropping the test support for python version lower than 3.6. v0.6.0 should work with python 2.7 but is not guaranteed to work. Please upgrade to python 3.6+."
+
+  version: 0.6.0
+  date: 21.04.2020
+- changes:
+  - action: updated
+    details:
+    - "`#185`: fix a bug with http data source. The real fix lies in pyexcel-io v0.5.19. this release just put the version requirement in."
+  version: 0.5.15
+  date: 07.07.2019
 - changes:
   - action: updated
     details:
@@ -61,7 +117,7 @@ releases:
     details:
     - '`#126`, dest_sheet_name in save_as will set the sheet name in the output'
     - '`#115`, Fix set membership test to run faster in python2'
-  date: unreleased
+  date: 26.03.2018
   version: 0.5.8
 - changes:
   - action: added
diff --git a/docs/source/_static/images/architecture.svg b/docs/source/_static/images/architecture.svg
index 813cbe77..33be4950 100644
--- a/docs/source/_static/images/architecture.svg
+++ b/docs/source/_static/images/architecture.svg
@@ -1,4 +1,4 @@
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pyexcel-libxlsxw--><path d="M677.2155,366.1401 C675.9598,384.8859 674.3127,409.4746 673.2085,425.9587 " fill="none" id="libxlsxwpy-pyexcel-libxlsxw" style="stroke: #A80036; stroke-width: 1.0;"/><!--link libxlsxwpy to libxlsx--><path d="M737.7813,339.5 C749.3122,339.5 760.8432,339.5 772.3741,339.5 " fill="none" id="libxlsxwpy-libxlsx" style="stroke: #A80036; stroke-width: 1.0;"/><!--
 @startuml
 
 package "pyexcel" {
@@ -31,6 +31,8 @@ cloud "xls, xlsx" {
 [pyexcel-xls]
 [pyexcel-xlsx]
 [pyexcel-xlsxw]
+[pyexcel-libxlsxw]
+[pyexcel-xlsxr]
 }
 
 [tabulate] <<dependency>>
@@ -42,6 +44,9 @@ cloud "xls, xlsx" {
 [xlsxwriter] <<dependency>>
 [ezodf] <<dependency>>
 [odfpy] <<dependency>>
+[lxml] <<dependency>>
+[libxlsxwpy] <<dependency>>
+[libxlsx] <<dependency>>
 
 [pyexcel public api] -right-> [pyexcel internal api]
 [pyexcel internal api] -right-> [pyexcel plugin interfaces]
@@ -59,21 +64,29 @@ cloud "xls, xlsx" {
 [pyexcel-io plugin interfaces] ..> [csv, csvz, tsv, tsvz]
 [pyexcel-io plugin interfaces] ..> [django, sqlalchemy]
 [pyexcel-io plugin interfaces] .up.> [pyexcel-xls]
+[pyexcel-io plugin interfaces] .up.> [pyexcel-xlsxw]
+[pyexcel-io plugin interfaces] .up.> [pyexcel-libxlsxw]
 [pyexcel-io plugin interfaces] .up.> [pyexcel-xlsx]
+[pyexcel-io plugin interfaces] .up.> [pyexcel-xlsxr]
 [pyexcel-io plugin interfaces] .left.> [pyexcel-ods]
 [pyexcel-io plugin interfaces] .right.> [pyexcel-ods3]
-[pyexcel-io plugin interfaces] .right.> [pyexcel-xlsxw]
 [pyexcel-io plugin interfaces] .right.> [pyexcel-odsr]
 
+
 [pyexcel-text] -up- [tabulate]
 [pyexcel-pygal] -up- [pygal]
 [pyexcel-handsontable] -up- [handsontable]
 [pyexcel-xls] -right- [xlrd]
 [pyexcel-xls] -right- [xlwt]
 [pyexcel-xlsx] -right- [openpyxl]
-[pyexcel-xlsxw] -down- [xlsxwriter]
+[pyexcel-xlsxw] -up- [xlsxwriter]
 [pyexcel-ods3] - - - [ezodf]
 [pyexcel-ods] - - - [odfpy]
+[pyexcel-odsr] -up- [lxml]
+[pyexcel-xlsxr] -right- [lxml]
+[sphinxcontrib-excel] -right-> [pyexcel-handsontable]
+[pyexcel-libxlsxw] -up- [libxlsxwpy]
+[libxlsxwpy] -right- [libxlsx]
 
 skinparam component{
 
@@ -89,8 +102,8 @@ Java Runtime: Java(TM) SE Runtime Environment
 JVM: Java HotSpot(TM) 64-Bit Server VM
 Java Version: 1.8.0_131-b11
 Operating System: Mac OS X
-OS Version: 10.11.6
+OS Version: 10.14.6
 Default Encoding: UTF-8
 Language: en
-Country: US
+Country: GB
 --></g></svg>
\ No newline at end of file
diff --git a/docs/source/api.rst b/docs/source/api.rst
index f53232bc..108b3848 100644
--- a/docs/source/api.rst
+++ b/docs/source/api.rst
@@ -179,21 +179,6 @@ Attributes
    Sheet.row_range
    Sheet.column_range
 
-Iteration
------------------
-
-.. autosummary::
-   :toctree: generated/
-
-   Sheet.rows
-   Sheet.rrows
-   Sheet.columns
-   Sheet.rcolumns
-   Sheet.enumerate
-   Sheet.reverse
-   Sheet.vertical
-   Sheet.rvertical
-
 
 Cell access
 ------------------
@@ -301,6 +286,7 @@ Transformation
 .. autosummary::
    :toctree: generated/
 
+   Sheet.project
    Sheet.transpose
    Sheet.map
    Sheet.region
diff --git a/docs/source/attributes.rst b/docs/source/attributes.rst
index 84a9f692..379eb433 100644
--- a/docs/source/attributes.rst
+++ b/docs/source/attributes.rst
@@ -68,7 +68,7 @@ Yet, it is possible assign a absolute url to an online excel file to an instance
 .. testcode::
    :hide:
 
-   >>> from mock import patch, MagicMock
+   >>> from unittest.mock import patch, MagicMock
    >>> import os
    >>> patcher = patch('pyexcel._compact.request.urlopen')
    >>> fake_url_open = patcher.start()
@@ -254,7 +254,7 @@ How about setting content via a url?
 .. testcode::
    :hide:
 
-   >>> from mock import patch, MagicMock
+   >>> from unittest.mock import patch, MagicMock
    >>> import os
    >>> patcher = patch('pyexcel._compact.request.urlopen')
    >>> fake_url_open = patcher.start()
diff --git a/docs/source/bigdata.rst b/docs/source/bigdata.rst
index 43538dbb..578e3a02 100644
--- a/docs/source/bigdata.rst
+++ b/docs/source/bigdata.rst
@@ -2,63 +2,43 @@
 Read partial data
 ================================================================================
 
-.. _get_an_array_from_an_excel_sheet:
 
-Here the code to get an array of data from your excel file. 
 
-.. pyexcel-table::
-
-   ---pyexcel:data example---
-   1,2,3
-   4,5,6
-   7,8,9
-
-.. testcode::
-   :hide:
-
-   >>> import pyexcel as pe
-   >>> data = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
-   >>> s = pe.Sheet(data)
-   >>> s.save_as("example.xls")
-
-The following code will give you the data in json::
-
-    >>> import pyexcel
-    >>> # "example.csv","example.xlsx","example.xlsm"
-    >>> my_array = pyexcel.get_array(file_name="example.xls")
-    >>> my_array
-    [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
-
-.. testcode::
-   :hide:
+When you are dealing with huge amount of data, e.g. 64GB, obviously you would not
+like to fill up your memory with those data. What you may want to do is, record
+data from Nth line, take M records and stop. And you only want to use your memory
+for the M records, not for beginning part nor for the tail part.
 
-   >>> import os
-   >>> os.unlink("example.xls")
+Hence partial read feature is developed to read partial data into memory for
+processing. 
 
+You can paginate by row, by column and by both, hence you dictate what portion of the
+data to read back. But remember only row limit features help you save memory. Let's
+you use this feature to record data from Nth column, take M number of columns and skip
+the rest. You are not going to reduce your memory footprint.
 
-Pagination
+Why did not I see above benefit?
 --------------------------------------------------------------------------------
 
-When you are dealing with huge amount of data, e.g. 64GB, obviously you would not
-like to fill up your memory with those data. Hence pagination feature is developed
-to read partial data into memory for processing. You can paginate by row, by
-column and by both.
+This feature depends heavily on the implementation details.
+
+`pyexcel-xls`_ (xlrd), `pyexcel-xlsx`_ (openpyxl), `pyexcel-ods`_ (odfpy) and
+`pyexcel-ods3`_ (pyexcel-ezodf) will read all data into memory. Because xls,
+xlsx and ods file are effective a zipped folder, all four will unzip the folder
+and read the content in xml format in **full**, so as to make sense of all details.
 
-Please note that `pyexcel-xls`, `pyexcel-xlsx`, `pyexcel-ods` and `pyexcel-ods3`
-will read all data into memory. And pagination code here only limits the data
-returned to your program. With that said, csv readers, `pyexcel-xlsxr` and `pyexcel-odsr`
-DOES read partial data into memory.
+Hence, during the partial data is been returned, the memory consumption won't
+differ from reading the whole data back. Only after the partial
+data is returned, the memory comsumption curve shall jump the cliff. So pagination
+code here only limits the data returned to your program.
 
+With that said, `pyexcel-xlsxr`_, `pyexcel-odsr`_ and `pyexcel-htmlr`_ DOES read
+partial data into memory. Those three are implemented in such a way that they
+consume the xml(html) when needed. When they have read designated portion of the
+data, they stop, even if they are half way through.
 
-.. testcode::
-   :hide:
+In addition, pyexcel's csv readers can read partial data into memory too.
 
-    >>> import sys
-    >>> if sys.version_info[0] < 3:
-    ...     from StringIO import StringIO
-    ... else:
-    ...     from io import StringIO
-    >>> from pyexcel_io._compact import OrderedDict
 
 Let's assume the following file is a huge csv file:
 
@@ -76,8 +56,10 @@ Let's assume the following file is a huge csv file:
    ... ]
    >>> pe.save_as(array=data, dest_file_name="your_file.csv")
 
+
 And let's pretend to read partial data:
 
+
 .. code-block:: python
 
    >>> pe.get_sheet(file_name="your_file.csv", start_row=2, row_limit=3)
@@ -146,12 +128,16 @@ to "your_file.xls" but increase each element by 1.
 
 What we can do is to define a row renderer function as the following:
 
+.. code-block:: python
+
    >>> def increment_by_one(row):
    ...     for element in row:
    ...         yield element + 1
 
 Then pass it onto save_as function using row_renderer:
 
+.. code-block:: python
+
    >>> pe.isave_as(file_name="your_file.csv",
    ...             row_renderer=increment_by_one,
    ...             dest_file_name="your_file.xlsx")
@@ -163,6 +149,8 @@ Then pass it onto save_as function using row_renderer:
    
 We can verify if it was done correctly:
 
+.. code-block:: python
+
    >>> pe.get_sheet(file_name="your_file.xlsx")
    your_file.csv:
    +---+----+----+
@@ -178,10 +166,3 @@ We can verify if it was done correctly:
    +---+----+----+
    | 7 | 27 | 37 |
    +---+----+----+
-
-.. testcode::
-   :hide:
-
-    >>> import os
-    >>> os.unlink("your_file.csv")
-    >>> os.unlink("your_file.xlsx")
diff --git a/docs/source/book.rst b/docs/source/book.rst
index e28075e9..938e34f1 100644
--- a/docs/source/book.rst
+++ b/docs/source/book.rst
@@ -64,11 +64,11 @@ And you can randomly access a cell in a sheet::
     1
 
 .. TIP::
-  With pyexcel, you can regard single sheet reader as an
-  two dimensional array and multi-sheet excel book reader
-  as a ordered dictionary of two dimensional arrays.
+  With pyexcel, you can regard single sheet as an
+  two dimensional array and multi-sheet excel book
+  as an ordered dictionary of two dimensional arrays.
 
-**Write multiple sheet excel file**
+**Write multiple sheet excel book**
 
 Suppose you have previous data as a dictionary and you want to 
 save it as multiple sheet excel file::
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 951d683d..bada39b9 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -8,7 +8,7 @@ DESCRIPTION = (
 #
 # This file only contains a selection of the most common options. For a full
 # list see the documentation:
-# http://www.sphinx-doc.org/en/master/config
+# https://www.sphinx-doc.org/en/master/usage/configuration.html
 
 # -- Path setup --------------------------------------------------------------
 
@@ -23,19 +23,19 @@ DESCRIPTION = (
 # -- Project information -----------------------------------------------------
 
 project = 'pyexcel'
-copyright = '2014-2019 Onni Software Ltd.'
-author = 'C.W.'
+copyright = '2014-2020 Onni Software Ltd.'
+author = 'chfw'
 # The short X.Y version
-version = '0.5.14'
+version = '0.6.6'
 # The full version, including alpha/beta/rc tags
-release = '0.5.14'
+release = '0.6.6'
 
 # -- General configuration ---------------------------------------------------
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions = [    'sphinx.ext.autodoc',    'sphinx.ext.doctest',    'sphinx.ext.intersphinx',    'sphinx.ext.viewcode',]
+extensions = [    'sphinx.ext.autosummary',    'sphinx.ext.autodoc',    'sphinx.ext.doctest',    'sphinx.ext.intersphinx',    'sphinx.ext.viewcode',    'sphinxcontrib.excel',]
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
@@ -69,11 +69,9 @@ html_static_path = ['_static']
 # -- Options for intersphinx extension ---------------------------------------
 
 # Example configuration for intersphinx: refer to the Python standard library.
-intersphinx_mapping = {'https://docs.python.org/': None}
+intersphinx_mapping = {'https://docs.python.org/3/': None}
 # TODO: html_theme not configurable upstream
 html_theme = 'default'
-
-
 def setup(app):
     app.add_stylesheet('theme_overrides.css')
 
@@ -90,5 +88,4 @@ texinfo_documents = [
 intersphinx_mapping.update({
     'xlrd': ('http://xlrd.readthedocs.io/en/latest/', None)
 })
-
 master_doc = "index"
diff --git a/docs/source/database.rst b/docs/source/database.rst
index fe93a0e4..3a633264 100644
--- a/docs/source/database.rst
+++ b/docs/source/database.rst
@@ -77,4 +77,5 @@ Done it. It is that simple. Let's verify what has been imported to make sure.
    :hide:
 
    >>> session.close()
+   >>> os.unlink('birth.xls')
    >>> os.unlink('birth.db')
diff --git a/docs/source/generated/pyexcel.Sheet.columns.rst b/docs/source/generated/pyexcel.Sheet.columns.rst
deleted file mode 100644
index 82a43af7..00000000
--- a/docs/source/generated/pyexcel.Sheet.columns.rst
+++ /dev/null
@@ -1,6 +0,0 @@
-pyexcel.Sheet.columns
-=====================
-
-.. currentmodule:: pyexcel
-
-.. automethod:: Sheet.columns
\ No newline at end of file
diff --git a/docs/source/generated/pyexcel.Sheet.enumerate.rst b/docs/source/generated/pyexcel.Sheet.enumerate.rst
deleted file mode 100644
index 8a259ce3..00000000
--- a/docs/source/generated/pyexcel.Sheet.enumerate.rst
+++ /dev/null
@@ -1,6 +0,0 @@
-pyexcel.Sheet.enumerate
-=======================
-
-.. currentmodule:: pyexcel
-
-.. automethod:: Sheet.enumerate
\ No newline at end of file
diff --git a/docs/source/generated/pyexcel.Sheet.reverse.rst b/docs/source/generated/pyexcel.Sheet.project.rst
similarity index 50%
rename from docs/source/generated/pyexcel.Sheet.reverse.rst
rename to docs/source/generated/pyexcel.Sheet.project.rst
index 83828b2c..56b4008a 100644
--- a/docs/source/generated/pyexcel.Sheet.reverse.rst
+++ b/docs/source/generated/pyexcel.Sheet.project.rst
@@ -1,6 +1,6 @@
-pyexcel.Sheet.reverse
+pyexcel.Sheet.project
 =====================
 
 .. currentmodule:: pyexcel
 
-.. automethod:: Sheet.reverse
\ No newline at end of file
+.. automethod:: Sheet.project
\ No newline at end of file
diff --git a/docs/source/generated/pyexcel.Sheet.rcolumns.rst b/docs/source/generated/pyexcel.Sheet.rcolumns.rst
deleted file mode 100644
index d6afa4af..00000000
--- a/docs/source/generated/pyexcel.Sheet.rcolumns.rst
+++ /dev/null
@@ -1,6 +0,0 @@
-pyexcel.Sheet.rcolumns
-======================
-
-.. currentmodule:: pyexcel
-
-.. automethod:: Sheet.rcolumns
\ No newline at end of file
diff --git a/docs/source/generated/pyexcel.Sheet.rows.rst b/docs/source/generated/pyexcel.Sheet.rows.rst
deleted file mode 100644
index 8d768d36..00000000
--- a/docs/source/generated/pyexcel.Sheet.rows.rst
+++ /dev/null
@@ -1,6 +0,0 @@
-pyexcel.Sheet.rows
-==================
-
-.. currentmodule:: pyexcel
-
-.. automethod:: Sheet.rows
\ No newline at end of file
diff --git a/docs/source/generated/pyexcel.Sheet.rrows.rst b/docs/source/generated/pyexcel.Sheet.rrows.rst
deleted file mode 100644
index 707915f3..00000000
--- a/docs/source/generated/pyexcel.Sheet.rrows.rst
+++ /dev/null
@@ -1,6 +0,0 @@
-pyexcel.Sheet.rrows
-===================
-
-.. currentmodule:: pyexcel
-
-.. automethod:: Sheet.rrows
\ No newline at end of file
diff --git a/docs/source/generated/pyexcel.Sheet.rst b/docs/source/generated/pyexcel.Sheet.rst
index 5f280e46..8aa373fe 100644
--- a/docs/source/generated/pyexcel.Sheet.rst
+++ b/docs/source/generated/pyexcel.Sheet.rst
@@ -15,6 +15,7 @@ pyexcel.Sheet
    
       ~Sheet.__init__
       ~Sheet.cell_value
+      ~Sheet.clone
       ~Sheet.column_at
       ~Sheet.column_range
       ~Sheet.columns
@@ -74,6 +75,7 @@ pyexcel.Sheet
       ~Sheet.number_of_rows
       ~Sheet.paste
       ~Sheet.plot
+      ~Sheet.project
       ~Sheet.rcolumns
       ~Sheet.region
       ~Sheet.register_input
diff --git a/docs/source/generated/pyexcel.Sheet.rvertical.rst b/docs/source/generated/pyexcel.Sheet.rvertical.rst
deleted file mode 100644
index aaf19838..00000000
--- a/docs/source/generated/pyexcel.Sheet.rvertical.rst
+++ /dev/null
@@ -1,6 +0,0 @@
-pyexcel.Sheet.rvertical
-=======================
-
-.. currentmodule:: pyexcel
-
-.. automethod:: Sheet.rvertical
\ No newline at end of file
diff --git a/docs/source/generated/pyexcel.Sheet.vertical.rst b/docs/source/generated/pyexcel.Sheet.vertical.rst
deleted file mode 100644
index e72f5f83..00000000
--- a/docs/source/generated/pyexcel.Sheet.vertical.rst
+++ /dev/null
@@ -1,6 +0,0 @@
-pyexcel.Sheet.vertical
-======================
-
-.. currentmodule:: pyexcel
-
-.. automethod:: Sheet.vertical
\ No newline at end of file
diff --git a/docs/source/guide.rst b/docs/source/guide.rst
index 01b0d221..eb0d9dab 100644
--- a/docs/source/guide.rst
+++ b/docs/source/guide.rst
@@ -40,34 +40,12 @@ On Windows systems, please issue this command::
 
     > test.bat
 
-How to update test environment and update documentation
----------------------------------------------------------
 
-Additional steps are required:
-
-#. pip install moban
-#. git clone https://github.com/moremoban/setupmobans.git # generic setup
-#. git clone https://github.com/pyexcel/pyexcel-commons.git commons
-#. make your changes in `.moban.d` directory, then issue command `moban`
-
-What is pyexcel-commons
----------------------------------
-
-Many information that are shared across pyexcel projects, such as: this developer guide, license info, etc. are stored in `pyexcel-commons` project.
-
-What is .moban.d
----------------------------------
+Before you commit
+------------------------------
 
-`.moban.d` stores the specific meta data for the library.
+Please run::
 
-Acceptance criteria
--------------------
+    $ make format
 
-#. Has Test cases written
-#. Has all code lines tested
-#. Passes all Travis CI builds
-#. Has fair amount of documentation if your change is complex
-#. run 'make format' so as to confirm the pyexcel organisation's coding style
-#. Please update CHANGELOG.rst
-#. Please add yourself to CONTRIBUTORS.rst
-#. Agree on NEW BSD License for your contribution
+so as to beautify your code otherwise travis-ci may fail your unit test.
diff --git a/docs/source/iapi/pyexcel.internal.sheets.Matrix.rst b/docs/source/iapi/pyexcel.internal.sheets.Matrix.rst
index 5a45bbb4..1c8e826e 100644
--- a/docs/source/iapi/pyexcel.internal.sheets.Matrix.rst
+++ b/docs/source/iapi/pyexcel.internal.sheets.Matrix.rst
@@ -15,6 +15,7 @@ pyexcel.internal.sheets.Matrix
    
       ~Matrix.__init__
       ~Matrix.cell_value
+      ~Matrix.clone
       ~Matrix.column_at
       ~Matrix.column_range
       ~Matrix.columns
diff --git a/docs/source/index.rst b/docs/source/index.rst
index 48759ba5..a06ee0bd 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -1,7 +1,7 @@
 `pyexcel` - Let you focus on data, instead of file formats
 ================================================================================
 
-:Author: C.W.
+:Author: chfw
 :Source code: http://github.com/pyexcel/pyexcel.git
 :Issues: http://github.com/pyexcel/pyexcel/issues
 :License: New BSD License
@@ -21,21 +21,22 @@ were not and will not be considered.
 
 The idea originated from the common usability problem: when an excel file
 driven web application is delivered for non-developer users (ie: team assistant,
-human resource administrator etc). The fact is that not everyone knows (or cares) about the
-differences between various excel formats: csv, xls, xlsx are all the same to them. Instead of training those users
-about file formats, this library helps web developers to handle most of the excel file
-formats by providing a common programming interface. To add a specific excel file format type
-to you application, all you need is to install an extra pyexcel plugin. Hence no code changes
-to your application and no issues with excel file formats any more. Looking at the
-community, this library and its associated ones try to become a small and easy to
-install alternative to Pandas.
+human resource administrator etc). The fact is that not everyone knows (or cares)
+about the differences between various excel formats: csv, xls, xlsx are all
+the same to them. Instead of training those users about file formats, this
+library helps web developers to handle most of the excel file
+formats by providing a common programming interface. To add a specific excel
+file format type to you application, all you need is to install an extra pyexcel
+plugin. Hence no code changes to your application and no issues with excel file
+formats any more. Looking at the community, this library and its associated ones
+try to become a small and easy to install alternative to Pandas.
 
 
 Support the project
 ================================================================================
 
 If your company has embedded pyexcel and its components into a revenue generating
-product, please support me on `patreon <https://www.patreon.com/bePatron?u=5537627>`_
+product, please support me on github, `patreon <https://www.patreon.com/bePatron?u=5537627>`_
 or `bounty source <https://salt.bountysource.com/teams/chfw-pyexcel>`_ to maintain
 the project and develop it further.
 
@@ -68,6 +69,127 @@ or clone it and install it:
     $ cd pyexcel
     $ python setup.py install
 
+Suppose you have the following data in a dictionary:
+
+========= ====
+Name      Age
+========= ====
+Adam      28
+Beatrice  29
+Ceri      30
+Dean      26
+========= ====
+
+you can easily save it into an excel file using the following code:
+
+.. code-block:: python
+
+   >>> import pyexcel
+   >>> # make sure you had pyexcel-xls installed
+   >>> a_list_of_dictionaries = [
+   ...     {
+   ...         "Name": 'Adam',
+   ...         "Age": 28
+   ...     },
+   ...     {
+   ...         "Name": 'Beatrice',
+   ...         "Age": 29
+   ...     },
+   ...     {
+   ...         "Name": 'Ceri',
+   ...         "Age": 30
+   ...     },
+   ...     {
+   ...         "Name": 'Dean',
+   ...         "Age": 26
+   ...     }
+   ... ]
+   >>> pyexcel.save_as(records=a_list_of_dictionaries, dest_file_name="your_file.xls")
+
+And here's how to obtain the records:
+
+.. code-block:: python
+
+   >>> import pyexcel as p
+   >>> records = p.iget_records(file_name="your_file.xls")
+   >>> for record in records:
+   ...     print("%s is aged at %d" % (record['Name'], record['Age']))
+   Adam is aged at 28
+   Beatrice is aged at 29
+   Ceri is aged at 30
+   Dean is aged at 26
+   >>> p.free_resources()
+
+
+Custom data rendering:
+
+.. code-block:: python
+
+    >>> # pip install pyexcel-text==0.2.7.1
+    >>> import pyexcel as p
+    >>> ccs_insight2 = p.Sheet()
+    >>> ccs_insight2.name = "Worldwide Mobile Phone Shipments (Billions), 2017-2021"
+    >>> ccs_insight2.ndjson = """
+    ... {"year": ["2017", "2018", "2019", "2020", "2021"]}
+    ... {"smart phones": [1.53, 1.64, 1.74, 1.82, 1.90]}
+    ... {"feature phones": [0.46, 0.38, 0.30, 0.23, 0.17]}
+    ... """.strip()
+    >>> ccs_insight2
+    pyexcel sheet:
+    +----------------+------+------+------+------+------+
+    | year           | 2017 | 2018 | 2019 | 2020 | 2021 |
+    +----------------+------+------+------+------+------+
+    | smart phones   | 1.53 | 1.64 | 1.74 | 1.82 | 1.9  |
+    +----------------+------+------+------+------+------+
+    | feature phones | 0.46 | 0.38 | 0.3  | 0.23 | 0.17 |
+    +----------------+------+------+------+------+------+
+
+
+Advanced usage :fire:
+----------------------
+
+If you are dealing with big data, please consider these usages:
+
+.. code-block:: python
+
+   >>> def increase_everyones_age(generator):
+   ...     for row in generator:
+   ...         row['Age'] += 1
+   ...         yield row
+   >>> def duplicate_each_record(generator):
+   ...     for row in generator:
+   ...         yield row
+   ...         yield row
+   >>> records = p.iget_records(file_name="your_file.xls")
+   >>> io=p.isave_as(records=duplicate_each_record(increase_everyones_age(records)),
+   ...     dest_file_type='csv', dest_lineterminator='\n')
+   >>> print(io.getvalue())
+   Age,Name
+   29,Adam
+   29,Adam
+   30,Beatrice
+   30,Beatrice
+   31,Ceri
+   31,Ceri
+   27,Dean
+   27,Dean
+   <BLANKLINE>
+
+
+Two advantages of above method:
+
+#. Add as many wrapping functions as you want.
+#. Constant memory consumption
+
+
+.. testcode::
+   :hide:
+
+   >>> import os
+   >>> os.unlink("your_file.xls")
+
+
+
 For individual excel file formats, please install them as you wish:
 
 .. _file-format-list:
@@ -75,33 +197,56 @@ For individual excel file formats, please install them as you wish:
 
 .. table:: A list of file formats supported by external plugins
 
-   ======================== ======================= ================= ==================
-   Package name              Supported file formats  Dependencies     Python versions
-   ======================== ======================= ================= ==================
-   `pyexcel-io`_            csv, csvz [#f1]_, tsv,                    2.6, 2.7, 3.3,
-                            tsvz [#f2]_                               3.4, 3.5, 3.6
-                                                                      pypy
-   `pyexcel-xls`_           xls, xlsx(read only),   `xlrd`_,          same as above
+   ======================== ======================= =================
+   Package name              Supported file formats  Dependencies
+   ======================== ======================= =================
+   `pyexcel-io`_            csv, csvz [#f1]_, tsv,
+                            tsvz [#f2]_
+   `pyexcel-xls`_           xls, xlsx(read only),   `xlrd`_,
                             xlsm(read only)         `xlwt`_
-   `pyexcel-xlsx`_          xlsx                    `openpyxl`_       same as above
-   `pyexcel-ods3`_          ods                     `pyexcel-ezodf`_, 2.6, 2.7, 3.3, 3.4
-                                                    lxml              3.5, 3.6
-   `pyexcel-ods`_           ods                     `odfpy`_          same as above
-   ======================== ======================= ================= ==================
+   `pyexcel-xlsx`_          xlsx                    `openpyxl`_
+   `pyexcel-ods3`_          ods                     `pyexcel-ezodf`_,
+                                                    lxml
+   `pyexcel-ods`_           ods                     `odfpy`_
+   ======================== ======================= =================
 
 .. table:: Dedicated file reader and writers
 
-   ======================== ======================= ================= ==================
-   Package name              Supported file formats  Dependencies     Python versions
-   ======================== ======================= ================= ==================
-   `pyexcel-xlsxw`_         xlsx(write only)        `XlsxWriter`_     Python 2 and 3
-   `pyexcel-xlsxr`_         xlsx(read only)         lxml              same as above
-   `pyexcel-xlsbr`_         xlsx(read only)         pyxlsb            same as above
-   `pyexcel-odsr`_          read only for ods, fods lxml              same as above
-   `pyexcel-odsw`_          write only for ods      loxun             same as above
-   `pyexcel-htmlr`_         html(read only)         lxml,html5lib     same as above
-   `pyexcel-pdfr`_          pdf(read only)          pdftables         Python 2 only.
-   ======================== ======================= ================= ==================
+   ======================== ======================= =================
+   Package name              Supported file formats  Dependencies
+   ======================== ======================= =================
+   `pyexcel-xlsxw`_         xlsx(write only)        `XlsxWriter`_
+   `pyexcel-libxlsxw`_      xlsx(write only)        `libxlsxwriter`_
+   `pyexcel-xlsxr`_         xlsx(read only)         lxml
+   `pyexcel-xlsbr`_         xlsb(read only)         pyxlsb
+   `pyexcel-odsr`_          read only for ods, fods lxml
+   `pyexcel-odsw`_          write only for ods      loxun
+   `pyexcel-htmlr`_         html(read only)         lxml,html5lib
+   `pyexcel-pdfr`_          pdf(read only)          camelot
+   ======================== ======================= =================
+
+
+Plugin shopping guide
+------------------------
+
+Since 2020, all pyexcel-io plugins have dropped the support for python version
+lower than 3.6. If you want to use any python verions, please use pyexcel-io
+and its plugins version lower than 0.6.0.
+
+
+Except csv files, xls, xlsx and ods files are a zip of a folder containing a lot of
+xml files
+
+The dedicated readers for excel files can stream read
+
+
+In order to manage the list of plugins installed, you need to use pip to add or remove
+a plugin. When you use virtualenv, you can have different plugins per virtual
+environment. In the situation where you have multiple plugins that does the same thing
+in your environment, you need to tell pyexcel which plugin to use per function call.
+For example, pyexcel-ods and pyexcel-odsr, and you want to get_array to use pyexcel-odsr.
+You need to append get_array(..., library='pyexcel-odsr').
+
 
 
 .. _pyexcel-io: https://github.com/pyexcel/pyexcel-io
@@ -114,6 +259,7 @@ For individual excel file formats, please install them as you wish:
 .. _pyexcel-pdfr: https://github.com/pyexcel/pyexcel-pdfr
 
 .. _pyexcel-xlsxw: https://github.com/pyexcel/pyexcel-xlsxw
+.. _pyexcel-libxlsxw: https://github.com/pyexcel/pyexcel-libxlsxw
 .. _pyexcel-xlsxr: https://github.com/pyexcel/pyexcel-xlsxr
 .. _pyexcel-xlsbr: https://github.com/pyexcel/pyexcel-xlsbr
 .. _pyexcel-htmlr: https://github.com/pyexcel/pyexcel-htmlr
@@ -124,6 +270,7 @@ For individual excel file formats, please install them as you wish:
 .. _XlsxWriter: https://github.com/jmcnamara/XlsxWriter
 .. _pyexcel-ezodf: https://github.com/pyexcel/pyexcel-ezodf
 .. _odfpy: https://github.com/eea/odfpy
+.. _libxlsxwriter: http://libxlsxwriter.github.io/getting_started.html
 
 .. table:: Other data renderers
 
@@ -157,13 +304,6 @@ For individual excel file formats, please install them as you wish:
 .. _pyexcel-gantt: https://github.com/pyexcel/pyexcel-gantt
 .. _frappe-gantt: https://github.com/frappe/gantt
 
-In order to manage the list of plugins installed, you need to use pip to add or remove
-a plugin. When you use virtualenv, you can have different plugins per virtual
-environment. In the situation where you have multiple plugins that does the same thing
-in your environment, you need to tell pyexcel which plugin to use per function call.
-For example, pyexcel-ods and pyexcel-odsr, and you want to get_array to use pyexcel-odsr.
-You need to append get_array(..., library='pyexcel-odsr').
-
 .. rubric:: Footnotes
 
 .. [#f1] zipped csv file
@@ -176,7 +316,9 @@ For compatibility tables of pyexcel-io plugins, please click `here <http://pyexc
     ======== ========== ============= ==================== ============= =============
     pyexcel  pyexcel-io pyexcel-text  pyexcel-handsontable pyexcel-pygal pyexcel-gantt
     ======== ========== ============= ==================== ============= =============
-    0.5.14+  0.5.18+    0.2.6+        0.0.1+               0.0.1         0.0.1
+    0.6.5+   0.6.2+     0.2.6+        0.0.1+               0.0.1         0.0.1
+    0.5.15+  0.5.19+    0.2.6+        0.0.1+               0.0.1         0.0.1
+    0.5.14   0.5.18     0.2.6+        0.0.1+               0.0.1         0.0.1
     0.5.10+  0.5.11+    0.2.6+        0.0.1+               0.0.1         0.0.1
     0.5.9.1+ 0.5.9.1+   0.2.6+        0.0.1                0.0.1         0.0.1
     0.5.4+   0.5.1+     0.2.6+        0.0.1                0.0.1         0.0.1
@@ -283,7 +425,7 @@ Design
    architecture
 
 New tutorial
-----------
+--------------
 .. toctree::
 
    quickstart
@@ -296,7 +438,7 @@ New tutorial
    database
 
 Old tutorial
-----------
+--------------
 .. toctree::
 
    tutorial_file
diff --git a/docs/source/migration_guide.rst b/docs/source/migration_guide.rst
index 29d53a6f..1bade5b9 100644
--- a/docs/source/migration_guide.rst
+++ b/docs/source/migration_guide.rst
@@ -1,3 +1,17 @@
+What's breaking in 0.6.0
+================================================================================
+
+In the following statements::
+
+    sheet_a = sheet.row + rows
+    sheet_b = sheet.column + columns
+    book = sheet_a + sheet_b
+
+`sheet_a` and `sheet_b` will no longer have access to the data of `sheet`. `book`
+will no longer have access to the data of `sheet_a` and `sheet_b`.
+
+Under Hyrum's Law, this enhancement in 0.6.0 will cause breakage otherwise.
+
 What's breaking in 0.5.9
 ================================================================================
 
diff --git a/docs/source/quickstart.rst b/docs/source/quickstart.rst
index d2f25f17..be05deae 100644
--- a/docs/source/quickstart.rst
+++ b/docs/source/quickstart.rst
@@ -1,10 +1,11 @@
+
 One liners
 ================================================================================
 
 This section shows you how to get data from your excel files and how to
 export data to excel files in **one line**
 
-One liner to get data from the excel files
+Read from the excel files
 --------------------------------------------------------------------------------
 
 Get a list of dictionaries
@@ -25,7 +26,9 @@ Get a list of dictionaries
    >>> sheet = p.get_sheet(file_content=content, file_type='csv')
    >>> sheet.save_as("your_file.xls")
 
-Suppose you want to process the :download:`following coffee data <coffee.csv>` (data source `coffee chart <https://cspinet.org/eating-healthy/ingredients-of-concern/caffeine-chart>`_ on the center for science in the public interest):
+
+Suppose you want to process the following coffee data (data source `coffee chart <https://cspinet.org/eating-healthy/ingredients-of-concern/caffeine-chart>`_ on the center for science in the public interest):
+
 
 .. pyexcel-table::
 
@@ -36,17 +39,19 @@ Suppose you want to process the :download:`following coffee data <coffee.csv>` (
    Starbucks Coffee Pike Place Roast,grande(16 oz.),310
    Panera Coffee Light Roast,regular(16 oz.),300
 
-Let's get a list of dictionary out from the xls file::
-   
+
+Let's get a list of dictionary out from the xls file:
+
+.. code-block:: python
+
    >>> records = p.get_records(file_name="your_file.xls")
 
-And let's check what do we have::
+And let's check what do we have:
+
+.. code-block:: python
 
-   >>> for record in records:
-   ...     print("%s of %s has %s mg" % (
-   ...         record['Serving Size'],
-   ...         record['Coffees'],
-   ...         record['Caffeine (mg)']))
+   >>> for r in records:
+   ...     print(f"{r['Serving Size']} of {r['Coffees']} has {r['Caffeine (mg)']} mg")
    venti(20 oz) of Starbucks Coffee Blonde Roast has 475 mg
    large(20 oz.) of Dunkin' Donuts Coffee with Turbo Shot has 398 mg
    grande(16 oz.) of Starbucks Coffee Pike Place Roast has 310 mg
@@ -56,18 +61,18 @@ And let's check what do we have::
 Get two dimensional array
 ********************************************************************************
 
-Instead, what if you have to use :meth:`pyexcel.get_array` to do the same:
+Instead, what if you have to use `pyexcel.get_array` to do the same:
+
+.. code-block:: python
 
    >>> for row in p.get_array(file_name="your_file.xls", start_row=1):
-   ...     print("%s of %s has %s mg" % (
-   ...         row[1],
-   ...         row[0],
-   ...         row[2]))
+   ...     print(f"{row[1]} of {row[0]} has {row[2]} mg")
    venti(20 oz) of Starbucks Coffee Blonde Roast has 475 mg
    large(20 oz.) of Dunkin' Donuts Coffee with Turbo Shot has 398 mg
    grande(16 oz.) of Starbucks Coffee Pike Place Roast has 310 mg
    regular(16 oz.) of Panera Coffee Light Roast has 300 mg
 
+
 where `start_row` skips the header row.
 
 
@@ -79,10 +84,12 @@ You can get a dictionary too:
 Now let's get a dictionary out from the spreadsheet:
 
 .. code-block:: python
-    
+
    >>> my_dict = p.get_dict(file_name="your_file.xls", name_columns_by_row=0)
 
-And check what do we have::
+And check what do we have:
+
+.. code-block:: python
 
    >>> from pyexcel._compact import OrderedDict
    >>> isinstance(my_dict, OrderedDict)
@@ -127,8 +134,10 @@ Get a dictionary of two dimensional array
    >>> data.update({"Sheet 3": a_dictionary_of_two_dimensional_arrays['Sheet 3']})
    >>> p.save_book_as(bookdict=data, dest_file_name="book.xls")
 
+
 Suppose you have a multiple sheet book as the following:
 
+
 .. pyexcel-table::
 
    ---pyexcel:Sheet 1---
@@ -146,11 +155,17 @@ Suppose you have a multiple sheet book as the following:
    3,2,1
    4,3,2
 
-Here is the code to obtain those sheets as a single dictionary::
+
+Here is the code to obtain those sheets as a single dictionary:
+
+.. code-block:: python
 
    >>> book_dict = p.get_book_dict(file_name="book.xls")
 
-And check::
+And check:
+
+.. code-block:: python
+
    >>> isinstance(book_dict, OrderedDict)
    True
    >>> import json
@@ -160,6 +175,7 @@ And check::
    {"Sheet 2": [["X", "Y", "Z"], [1, 2, 3], [4, 5, 6]]}
    {"Sheet 3": [["O", "P", "Q"], [3, 2, 1], [4, 3, 2]]}
 
+
 .. testcode::
    :hide:
 
@@ -167,21 +183,27 @@ And check::
    >>> os.unlink("book.xls")
 
 
-Data export in one line
+Write data
 ---------------------------------------------
 
 Export an array
 **********************
 
-Suppose you have the following array::
+Suppose you have the following array:
+
+.. code-block:: python
 
    >>> data = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
 
-And here is the code to save it as an excel file ::
+And here is the code to save it as an excel file :
+
+.. code-block:: python
 
    >>> p.save_as(array=data, dest_file_name="example.xls")
 
-Let's verify it::
+Let's verify it:
+
+.. code-block:: python
 
     >>> p.get_sheet(file_name="example.xls")
     pyexcel_sheet1:
@@ -199,14 +221,17 @@ Let's verify it::
    >>> import os
    >>> os.unlink("example.xls")
 
+And here is the code to save it as a csv file :
 
-And here is the code to save it as a csv file ::
+.. code-block:: python
 
    >>> p.save_as(array=data,
    ...           dest_file_name="example.csv",
    ...           dest_delimiter=':')
 
-Let's verify it::
+Let's verify it:
+
+.. code-block:: python
 
    >>> with open("example.csv") as f:
    ...     for line in f.readlines():
@@ -219,7 +244,7 @@ Let's verify it::
 Export a list of dictionaries
 **********************************
 
-::
+.. code-block:: python
 
     >>> records = [
     ...     {"year": 1903, "country": "Germany", "speed": "206.7km/h"},
@@ -232,7 +257,7 @@ Export a list of dictionaries
 Export a dictionary of single key value pair
 ********************************************************************************
 
-::
+.. code-block:: python
 
     >>> henley_on_thames_facts = {
     ...     "area": "5.58 square meters",
@@ -247,6 +272,8 @@ Export a dictionary of single key value pair
 Export a dictionary of single dimensonal array
 ********************************************************************************
 
+.. code-block:: python
+
     >>> ccs_insights = {
     ...     "year": ["2017", "2018", "2019", "2020", "2021"],
     ...     "smart phones": [1.53, 1.64, 1.74, 1.82, 1.90],
@@ -258,8 +285,10 @@ Export a dictionary of single dimensonal array
 Export a dictionary of two dimensional array as a book
 ********************************************************************************
 
-Suppose you want to save the below dictionary to an excel file ::
-  
+Suppose you want to save the below dictionary to an excel file :
+
+.. code-block:: python
+
    >>> a_dictionary_of_two_dimensional_arrays = {
    ...      'Sheet 1':
    ...          [
@@ -281,7 +310,9 @@ Suppose you want to save the below dictionary to an excel file ::
    ...          ]
    ...  }
 
-Here is the code::
+Here is the code:
+
+.. code-block:: python
 
    >>> p.save_book_as(
    ...    bookdict=a_dictionary_of_two_dimensional_arrays,
@@ -289,7 +320,9 @@ Here is the code::
    ... )
 
 If you want to preserve the order of sheets in your dictionary, you have to
-pass on an ordered dictionary to the function itself. For example::
+pass on an ordered dictionary to the function itself. For example:
+
+.. code-block:: python
 
    >>> data = OrderedDict()
    >>> data.update({"Sheet 2": a_dictionary_of_two_dimensional_arrays['Sheet 2']})
@@ -297,7 +330,9 @@ pass on an ordered dictionary to the function itself. For example::
    >>> data.update({"Sheet 3": a_dictionary_of_two_dimensional_arrays['Sheet 3']})
    >>> p.save_book_as(bookdict=data, dest_file_name="book.xls")
 
-Let's verify its order::
+Let's verify its order:
+
+.. code-block:: python
 
    >>> book_dict = p.get_book_dict(file_name="book.xls")
    >>> for key, item in book_dict.items():
@@ -309,15 +344,13 @@ Let's verify its order::
 Please notice that "Sheet 2" is the first item in the *book_dict*, meaning the order of sheets are preserved.
 
 
-File format transcoding on one line
+Transcoding
 -------------------------------------------
 
 .. note::
 
-   Please note that the following file transcoding could be with zero line. Please
-   install pyexcel-cli and you will do the transcode in one command. No need to
-   open your editor, save the problem, then python run.
-
+   Please note that `pyexcel-cli` can perform file transcoding at command line.
+   No need to open your editor, save the problem, then python run.
 
 .. testcode::
    :hide:
@@ -330,12 +363,17 @@ File format transcoding on one line
    ... ]
    >>> p.save_as(array=data, dest_file_name="birth.xls")
 
-The following code does a simple file format transcoding from xls to csv::
+
+The following code does a simple file format transcoding from xls to csv:
+
+.. code-block:: python
 
    >>> p.save_as(file_name="birth.xls", dest_file_name="birth.csv")
 
 Again it is really simple. Let's verify what we have gotten:
 
+.. code-block:: python
+
    >>> sheet = p.get_sheet(file_name="birth.csv")
    >>> sheet
    birth.csv:
@@ -354,11 +392,15 @@ Again it is really simple. Let's verify what we have gotten:
 
 Let use previous example and save it as xlsx instead
 
+.. code-block:: python
+
    >>> p.save_as(file_name="birth.xls",
    ...           dest_file_name="birth.xlsx") # change the file extension
 
 Again let's verify what we have gotten:
 
+.. code-block:: python
+
    >>> sheet = p.get_sheet(file_name="birth.xlsx")
    >>> sheet
    pyexcel_sheet1:
@@ -377,7 +419,9 @@ Excel book merge and split operation in one line
 Merge all excel files in directory into  a book where each file become a sheet
 ********************************************************************************
 
-The following code will merge every excel files into one file, say "output.xls"::
+The following code will merge every excel files into one file, say "output.xls":
+
+.. code-block:: python
 
     from pyexcel.cookbook import merge_all_to_a_book
     import glob
@@ -385,7 +429,9 @@ The following code will merge every excel files into one file, say "output.xls":
 
     merge_all_to_a_book(glob.glob("your_csv_directory\*.csv"), "output.xls")
 
-You can mix and match with other excel formats: xls, xlsm and ods. For example, if you are sure you have only xls, xlsm, xlsx, ods and csv files in `your_excel_file_directory`, you can do the following::
+You can mix and match with other excel formats: xls, xlsm and ods. For example, if you are sure you have only xls, xlsm, xlsx, ods and csv files in `your_excel_file_directory`, you can do the following:
+
+.. code-block:: python
 
     from pyexcel.cookbook import merge_all_to_a_book
     import glob
@@ -400,29 +446,32 @@ Split a book into single sheet files
    :hide:
 
     >>> content = {
-    ...     'Sheet 1': 
+    ...     'Sheet 1':
     ...         [
-    ...             [1.0, 2.0, 3.0], 
-    ...             [4.0, 5.0, 6.0], 
+    ...             [1.0, 2.0, 3.0],
+    ...             [4.0, 5.0, 6.0],
     ...             [7.0, 8.0, 9.0]
     ...         ],
-    ...     'Sheet 2': 
+    ...     'Sheet 2':
     ...         [
-    ...             ['X', 'Y', 'Z'], 
-    ...             [1.0, 2.0, 3.0], 
+    ...             ['X', 'Y', 'Z'],
+    ...             [1.0, 2.0, 3.0],
     ...             [4.0, 5.0, 6.0]
-    ...         ], 
-    ...     'Sheet 3': 
+    ...         ],
+    ...     'Sheet 3':
     ...         [
-    ...             ['O', 'P', 'Q'], 
-    ...             [3.0, 2.0, 1.0], 
+    ...             ['O', 'P', 'Q'],
+    ...             [3.0, 2.0, 1.0],
     ...             [4.0, 3.0, 2.0]
-    ...         ] 
+    ...         ]
     ... }
     >>> book = p.Book(content)
     >>> book.save_as("megabook.xls")
 
-Suppose you have many sheets in a work book and you would like to separate each into a single sheet excel file. You can easily do this::
+
+Suppose you have many sheets in a work book and you would like to separate each into a single sheet excel file. You can easily do this:
+
+.. code-block:: python
 
    >>> from pyexcel.cookbook import split_a_book
    >>> split_a_book("megabook.xls", "output.xls")
@@ -448,7 +497,9 @@ Extract just one sheet from a book
 *************************************
 
 
-Suppose you just want to extract one sheet from many sheets that exists in a work book and you would like to separate it into a single sheet excel file. You can easily do this::
+Suppose you just want to extract one sheet from many sheets that exists in a work book and you would like to separate it into a single sheet excel file. You can easily do this:
+
+.. code-block:: python
 
     >>> from pyexcel.cookbook import extract_a_sheet_from_a_book
     >>> extract_a_sheet_from_a_book("megabook.xls", "Sheet 1", "output.xls")
diff --git a/docs/source/renderers.rst b/docs/source/renderers.rst
index 78e80296..dce142f9 100644
--- a/docs/source/renderers.rst
+++ b/docs/source/renderers.rst
@@ -29,7 +29,7 @@ Draw charts from your excel data
 `pyexcel-echarts`_  draws 2D, 3D, geo charts from pyexcel data and has awesome animations too, but
 it is under development.
 
-`pyexcel-matplotlib`_ helps you with scentific charts and is under developmement.
+`pyexcel-matplotlib`_ helps you with scientific charts and is under developmement.
 
 Gantt chart visualization for your excel data
 -------------------------------------------------
@@ -43,4 +43,6 @@ Gantt chart visualization for your excel data
 .. _pyexcel-echarts: https://github.com/pyexcel-renderers/pyexcel-echarts
 .. _pyexcel-matplotlib: https://github.com/pyexcel-renderers/pyexcel-matplotlib
 .. _sphinxcontrib-excel: https://github.com/pyexcel-renderers/sphinxcontrib-excel
+.. _pyexcel-gantt: https://github.com/pyexcel-renderers/pyexcel-gantt
+
 
diff --git a/docs/source/sheet.rst b/docs/source/sheet.rst
index 8bd994d8..d8d0511c 100644
--- a/docs/source/sheet.rst
+++ b/docs/source/sheet.rst
@@ -1,6 +1,13 @@
 Sheet
 ==========
 
+The sheet api here is much less powerful than pandas DataFrame when the array is of
+significant size. To be honesty, pandas DataFrame is much more powerful and
+provide rich data manipulation apis. When would you consider the sheet api here?
+if your data manipulation steps are basic and your data volume is not high, you
+can use them.
+
+
 Random access
 -----------------
 
@@ -69,6 +76,8 @@ Here is the example code showing how you can randomly access a cell:
    In order to set a value to a cell, please use
    sheet[row_index, column_index] = new_value
 
+   or sheet['A1'] = new_value
+
 
 **Random access to rows and columns**
 
@@ -187,39 +196,6 @@ You can call :meth:`~pyexcel.Sheet.rows()` instead::
     >>> list(sheet.rows())
     [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
 
-You can get data from the bottom to the top one by
- calling :meth:`~pyexcel.Sheet.rrows()`::
-
-    >>> list(sheet.rrows())
-    [[7, 8, 9], [4, 5, 6], [1, 2, 3]]
-
-You might want the data arranged vertically. You can call
-:meth:`~pyexcel.Sheet.columns()`::
-
-    >>> list(sheet.columns())
-    [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
-
-You can get columns in reverse sequence as well by calling
-:meth:`~pyexcel.Sheet.rcolumns()`::
-
-    >>> list(sheet.rcolumns())
-    [[3, 6, 9], [2, 5, 8], [1, 4, 7]]
-
-Do you want to flatten the data? You can get the content in one
-dimensional array. If you are interested in playing with one
-dimensional enumeration, you can check out these functions
-:meth:`~pyexcel.Sheet.enumerate`, :meth:`~pyexcel.Sheet.reverse`,
-:meth:`~pyexcel.Sheet.vertical`, and :meth:`~pyexcel.Sheet.rvertical()`::
-
-    >>> list(sheet.enumerate())
-    [1, 2, 3, 4, 5, 6, 7, 8, 9]
-    >>> list(sheet.reverse())
-    [9, 8, 7, 6, 5, 4, 3, 2, 1]
-    >>> list(sheet.vertical())
-    [1, 4, 7, 2, 5, 8, 3, 6, 9]
-    >>> list(sheet.rvertical())
-    [9, 6, 3, 8, 5, 2, 7, 4, 1]
-
 
 **attributes**
 
@@ -398,12 +374,35 @@ Here is the example code to append two extra columns:
    ...    [12, 15]
    ... ]
    >>> sheet2 = pyexcel.Sheet(extra_data)
-   >>> sheet.column += sheet2
-   >>> sheet.column["Column 4"]
+   >>> sheet3 = sheet.column + sheet2
+   >>> sheet3.column["Column 4"]
    [10, 11, 12]
-   >>> sheet.column["Column 5"]
+   >>> sheet3.column["Column 5"]
    [13, 14, 15]
 
+Please note above column plus statement will not update original `sheet` instance, as
+pyexcel user demanded:
+
+.. code-block:: python
+
+    >>> sheet
+    pyexcel sheet:
+    +----------+----------+
+    | Column 1 | Column 3 |
+    +==========+==========+
+    | 1        | 7        |
+    +----------+----------+
+    | 2        | 8        |
+    +----------+----------+
+    | 3        | 9        |
+    +----------+----------+
+
+So, to change orginal `sheet` instance, you can elect to do:
+
+.. code-block:: python
+
+   >>> sheet.column += sheet2                
+
 Here is what you will get:
 
 .. code-block:: python
diff --git a/docs/source/sources.rst b/docs/source/sources.rst
index aa615f05..b9b92c77 100644
--- a/docs/source/sources.rst
+++ b/docs/source/sources.rst
@@ -161,12 +161,12 @@ book dict
 .. testcode::
    :hide:
 
-   >>> from mock import patch, MagicMock
+   >>> from unittest.mock import patch, MagicMock
    >>> import pyexcel as pe
-   >>> from pyexcel._compact import StringIO
+   >>> from pyexcel._compact import StringIO, PY2, BytesIO
    >>> patcher = patch('pyexcel._compact.request.urlopen')
    >>> urlopen = patcher.start()
-   >>> io = StringIO("1,2,3")
+   >>> io = StringIO("1,2,3") if PY2 else BytesIO("1,2,3".encode('utf-8'))
    >>> x = MagicMock()
    >>> x.type.return_value = "text/csv"
    >>> io.info = x
@@ -201,7 +201,7 @@ Get content
 .. testcode::
    :hide:
 
-   >>> from mock import patch, MagicMock
+   >>> from unittest.mock import patch, MagicMock
    >>> import os
    >>> patcher = patch('pyexcel._compact.request.urlopen')
    >>> fake_url_open = patcher.start()
@@ -241,7 +241,7 @@ How about setting content via a url?
 .. testcode::
    :hide:
 
-   >>> from mock import patch, MagicMock
+   >>> from unittest.mock import patch, MagicMock
    >>> import os
    >>> patcher = patch('pyexcel._compact.request.urlopen')
    >>> fake_url_open = patcher.start()
diff --git a/docs/source/tutorial.rst b/docs/source/tutorial.rst
index 073f00bf..6ce3bf5d 100644
--- a/docs/source/tutorial.rst
+++ b/docs/source/tutorial.rst
@@ -515,3 +515,4 @@ Do you want to flatten the data? You can get the content in one dimensional arra
    >>> os.unlink("output.csv")
    >>> os.unlink("example.xls")
    >>> os.unlink("example_series.xls")
+   >>> os.unlink("tutorial.csv")
diff --git a/docs/source/tutorial_file.rst b/docs/source/tutorial_file.rst
index ccea916a..34484ec1 100644
--- a/docs/source/tutorial_file.rst
+++ b/docs/source/tutorial_file.rst
@@ -251,13 +251,13 @@ you'd better to have the following kind of data:
    :hide:
 
    >>> import os
-   >>> import pyexcel
+   >>> import pyexcel as pe
    >>> data = [
    ...      ["Row 1", 1, 2, 3],
    ...      ["Row 2", 4, 5, 6],
    ...      ["Row 3", 7, 8, 9],
    ...  ]
-   >>> pyexcel.save_as(array=data, dest_file_name="row_example.xls")
+   >>> pe.save_as(array=data, dest_file_name="row_example.xls")
 
 And then you want to update "Row 3" with for example::
 
diff --git a/docs/source/two-liners.rst b/docs/source/two-liners.rst
index 1ec3e2fb..9ff1451d 100644
--- a/docs/source/two-liners.rst
+++ b/docs/source/two-liners.rst
@@ -1,8 +1,13 @@
+
 Stream APIs for big file : A set of two liners
 ================================================================================
 
+When you are dealing with **BIG** excel files, you will want **pyexcel** to use
+constant memory.
+
 This section shows you how to get data from your **BIG** excel files and how to
-export data to excel files in **two lines** at most.
+export data to excel files in **two lines** at most, without eating all
+your computer memory.
 
 
 Two liners for get data from big excel files
@@ -26,6 +31,8 @@ Get a list of dictionaries
    >>> sheet = p.get_sheet(file_content=content, file_type='csv')
    >>> sheet.save_as("your_file.xls")
 
+
+
 Suppose you want to process the following coffee data:
 
 .. pyexcel-table::
@@ -37,45 +44,49 @@ Suppose you want to process the following coffee data:
    Starbucks Coffee Pike Place Roast,grande(16 oz.),310
    Panera Coffee Light Roast,regular(16 oz.),300
 
-Let's get a list of dictionary out from the xls file::
-   
+Let's get a list of dictionary out from the xls file:
+
+.. code-block:: python
+
    >>> records = p.iget_records(file_name="your_file.xls")
 
-And let's check what do we have::
+And let's check what do we have:
+
+.. code-block:: python
 
-   >>> for record in records:
-   ...     print("%s of %s has %s mg" % (
-   ...         record['Serving Size'],
-   ...         record['Coffees'],
-   ...         record['Caffeine (mg)']))
+   >>> for r in records:
+   ...     print(f"{r['Serving Size']} of {r['Coffees']} has {r['Caffeine (mg)']} mg")
    venti(20 oz) of Starbucks Coffee Blonde Roast has 475 mg
    large(20 oz.) of Dunkin' Donuts Coffee with Turbo Shot has 398 mg
    grande(16 oz.) of Starbucks Coffee Pike Place Roast has 310 mg
    regular(16 oz.) of Panera Coffee Light Roast has 300 mg
 
-Please do not forgot the second line::
+Please do not forgot the second line to close the opened file handle:
+
+.. code-block:: python
 
    >>> p.free_resources()
 
 Get two dimensional array
 ********************************************************************************
 
-Instead, what if you have to use :meth:`pyexcel.get_array` to do the same:
+Instead, what if you have to use `pyexcel.get_array` to do the same:
+
+.. code-block:: python
 
    >>> for row in p.iget_array(file_name="your_file.xls", start_row=1):
-   ...     print("%s of %s has %s mg" % (
-   ...         row[1],
-   ...         row[0],
-   ...         row[2]))
+   ...     print(f"{row[1]} of {row[0]} has {row[2]} mg")
    venti(20 oz) of Starbucks Coffee Blonde Roast has 475 mg
    large(20 oz.) of Dunkin' Donuts Coffee with Turbo Shot has 398 mg
    grande(16 oz.) of Starbucks Coffee Pike Place Roast has 310 mg
    regular(16 oz.) of Panera Coffee Light Roast has 300 mg
 
-Again, do not forgot the second line::
+Again, do not forgot the second line:
+
+.. code-block:: python
 
    >>> p.free_resources()
-   
+
 where `start_row` skips the header row.
 
 Data export in one liners
@@ -84,20 +95,28 @@ Data export in one liners
 Export an array
 **********************
 
-Suppose you have the following array::
+Suppose you have the following array:
+
+.. code-block:: python
 
    >>> data = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
 
-And here is the code to save it as an excel file ::
+And here is the code to save it as an excel file :
+
+.. code-block:: python
 
    >>> p.isave_as(array=data, dest_file_name="example.xls")
 
 But the following line is not required because the data source
-are not file sources::
+are not file sources:
+
+.. code-block:: python
 
    >>> # p.free_resources()
 
-Let's verify it::
+Let's verify it:
+
+.. code-block:: python
 
     >>> p.get_sheet(file_name="example.xls")
     pyexcel_sheet1:
@@ -109,6 +128,7 @@ Let's verify it::
     | 7 | 8 | 9 |
     +---+---+---+
 
+
 .. testcode::
    :hide:
 
@@ -116,13 +136,17 @@ Let's verify it::
    >>> os.unlink("example.xls")
 
 
-And here is the code to save it as a csv file ::
+And here is the code to save it as a csv file :
+
+.. code-block:: python
 
    >>> p.isave_as(array=data,
    ...            dest_file_name="example.csv",
    ...            dest_delimiter=':')
 
-Let's verify it::
+Let's verify it:
+
+.. code-block:: python
 
    >>> with open("example.csv") as f:
    ...     for line in f.readlines():
@@ -135,7 +159,7 @@ Let's verify it::
 Export a list of dictionaries
 **********************************
 
-::
+.. code-block:: python
 
     >>> records = [
     ...     {"year": 1903, "country": "Germany", "speed": "206.7km/h"},
@@ -147,7 +171,7 @@ Export a list of dictionaries
 Export a dictionary of single key value pair
 ********************************************************************************
 
-::
+.. code-block:: python
 
     >>> henley_on_thames_facts = {
     ...     "area": "5.58 square meters",
@@ -161,6 +185,8 @@ Export a dictionary of single key value pair
 Export a dictionary of single dimensonal array
 ********************************************************************************
 
+.. code-block:: python
+
     >>> ccs_insights = {
     ...     "year": ["2017", "2018", "2019", "2020", "2021"],
     ...     "smart phones": [1.53, 1.64, 1.74, 1.82, 1.90],
@@ -172,8 +198,10 @@ Export a dictionary of single dimensonal array
 Export a dictionary of two dimensional array as a book
 ********************************************************************************
 
-Suppose you want to save the below dictionary to an excel file ::
-  
+Suppose you want to save the below dictionary to an excel file :
+
+.. code-block:: python
+
    >>> a_dictionary_of_two_dimensional_arrays = {
    ...      'Sheet 1':
    ...          [
@@ -195,7 +223,9 @@ Suppose you want to save the below dictionary to an excel file ::
    ...          ]
    ...  }
 
-Here is the code::
+Here is the code:
+
+.. code-block:: python
 
    >>> p.isave_book_as(
    ...    bookdict=a_dictionary_of_two_dimensional_arrays,
@@ -203,7 +233,9 @@ Here is the code::
    ... )
 
 If you want to preserve the order of sheets in your dictionary, you have to
-pass on an ordered dictionary to the function itself. For example::
+pass on an ordered dictionary to the function itself. For example:
+
+.. code-block:: python
 
    >>> from pyexcel._compact import OrderedDict
    >>> data = OrderedDict()
@@ -213,7 +245,9 @@ pass on an ordered dictionary to the function itself. For example::
    >>> p.isave_book_as(bookdict=data, dest_file_name="book.xls")
    >>> p.free_resources()
 
-Let's verify its order::
+Let's verify its order:
+
+.. code-block:: python
 
    >>> import json
    >>> book_dict = p.get_book_dict(file_name="book.xls")
@@ -247,13 +281,18 @@ File format transcoding on one line
    ... ]
    >>> p.isave_as(array=data, dest_file_name="birth.xls")
 
-The following code does a simple file format transcoding from xls to csv::
+
+The following code does a simple file format transcoding from xls to csv:
+
+.. code-block:: python
 
    >>> import pyexcel
    >>> p.save_as(file_name="birth.xls", dest_file_name="birth.csv")
 
 Again it is really simple. Let's verify what we have gotten:
 
+.. code-block:: python
+
    >>> sheet = p.get_sheet(file_name="birth.csv")
    >>> sheet
    birth.csv:
@@ -265,19 +304,23 @@ Again it is really simple. Let's verify what we have gotten:
    | Smith | 4.2    | 12/11/14 |
    +-------+--------+----------+
 
-.. NOTE::
+.. note::
 
    Please note that csv(comma separate value) file is pure text file. Formula, charts, images and formatting in xls file will disappear no matter which transcoding tool you use. Hence, pyexcel is a quick alternative for this transcoding job.
 
 
 Let use previous example and save it as xlsx instead
 
+.. code-block:: python
+
    >>> import pyexcel
    >>> p.isave_as(file_name="birth.xls",
    ...            dest_file_name="birth.xlsx") # change the file extension
 
 Again let's verify what we have gotten:
 
+.. code-block:: python
+
    >>> sheet = p.get_sheet(file_name="birth.xlsx")
    >>> sheet
    pyexcel_sheet1:
@@ -288,3 +331,10 @@ Again let's verify what we have gotten:
    +-------+--------+----------+
    | Smith | 4.2    | 12/11/14 |
    +-------+--------+----------+
+
+.. testcode::
+   :hide:
+
+   >>> import os
+   >>> os.unlink('ccs.csv')
+   >>> os.unlink('book.xls')
diff --git a/docs/source/uml/architecture.uml b/docs/source/uml/architecture.uml
index cacabd84..be6c230b 100644
--- a/docs/source/uml/architecture.uml
+++ b/docs/source/uml/architecture.uml
@@ -30,6 +30,8 @@ cloud "xls, xlsx" {
 [pyexcel-xls]
 [pyexcel-xlsx]
 [pyexcel-xlsxw]
+[pyexcel-libxlsxw]
+[pyexcel-xlsxr]
 }
 
 [tabulate] <<dependency>>
@@ -41,6 +43,9 @@ cloud "xls, xlsx" {
 [xlsxwriter] <<dependency>>
 [ezodf] <<dependency>>
 [odfpy] <<dependency>>
+[lxml] <<dependency>>
+[libxlsxwpy] <<dependency>>
+[libxlsx] <<dependency>>
 
 [pyexcel public api] -right-> [pyexcel internal api]
 [pyexcel internal api] -right-> [pyexcel plugin interfaces]
@@ -58,21 +63,29 @@ cloud "xls, xlsx" {
 [pyexcel-io plugin interfaces] ..> [csv, csvz, tsv, tsvz]
 [pyexcel-io plugin interfaces] ..> [django, sqlalchemy]
 [pyexcel-io plugin interfaces] .up.> [pyexcel-xls]
+[pyexcel-io plugin interfaces] .up.> [pyexcel-xlsxw]
+[pyexcel-io plugin interfaces] .up.> [pyexcel-libxlsxw]
 [pyexcel-io plugin interfaces] .up.> [pyexcel-xlsx]
+[pyexcel-io plugin interfaces] .up.> [pyexcel-xlsxr]
 [pyexcel-io plugin interfaces] .left.> [pyexcel-ods]
 [pyexcel-io plugin interfaces] .right.> [pyexcel-ods3]
-[pyexcel-io plugin interfaces] .right.> [pyexcel-xlsxw]
 [pyexcel-io plugin interfaces] .right.> [pyexcel-odsr]
 
+
 [pyexcel-text] -up- [tabulate]
 [pyexcel-pygal] -up- [pygal]
 [pyexcel-handsontable] -up- [handsontable]
 [pyexcel-xls] -right- [xlrd]
 [pyexcel-xls] -right- [xlwt]
 [pyexcel-xlsx] -right- [openpyxl]
-[pyexcel-xlsxw] -down- [xlsxwriter]
+[pyexcel-xlsxw] -up- [xlsxwriter]
 [pyexcel-ods3] --- [ezodf]
 [pyexcel-ods] --- [odfpy]
+[pyexcel-odsr] -up- [lxml]
+[pyexcel-xlsxr] -right- [lxml]
+[sphinxcontrib-excel] -right-> [pyexcel-handsontable]
+[pyexcel-libxlsxw] -up- [libxlsxwpy]
+[libxlsxwpy] -right- [libxlsx]
 
 skinparam component{
 
diff --git a/format.sh b/format.sh
new file mode 100644
index 00000000..f6b0088c
--- /dev/null
+++ b/format.sh
@@ -0,0 +1,3 @@
+isort $(find pyexcel -name "*.py"|xargs echo) $(find tests -name "*.py"|xargs echo)
+black -l 79 pyexcel
+black -l 79 tests
diff --git a/lint.sh b/lint.sh
index 12183c36..d31eeaa6 100644
--- a/lint.sh
+++ b/lint.sh
@@ -1 +1,2 @@
-flake8 . --exclude=.moban.d,docs --builtins=unicode,xrange,long
\ No newline at end of file
+pip install flake8
+flake8 --exclude=.moban.d,docs,setup.py   --builtins=unicode,xrange,long .  && python setup.py checkdocs
\ No newline at end of file
diff --git a/min_requirements.txt b/min_requirements.txt
index d253ea7a..18cae41b 100644
--- a/min_requirements.txt
+++ b/min_requirements.txt
@@ -1,9 +1,5 @@
 lml==0.0.4
-pyexcel-io==0.5.18
-texttable==0.8.3;python_version<"3"
-texttable==0.8.3;python_version>="3"
-ordereddict;python_version<"2.7"
-weakrefset;python_version<"2.7"
-lxml==3.4.4;platform_python_implementation=="PyPy"
+pyexcel-io==0.6.2
+texttable==0.8.3
 pyexcel-xlsx==0.4.1
 pyexcel-xls==0.4.1
diff --git a/pyexcel.yml b/pyexcel.yml
index 28e6794b..dd5844c7 100644
--- a/pyexcel.yml
+++ b/pyexcel.yml
@@ -1,24 +1,42 @@
 overrides: "pyexcel.yaml"
 name: "pyexcel"
+author: chfw
 nick_name: pyexcel
-version: 0.5.14
-current_version: 0.5.14
-release: 0.5.14
-copyright_year: 2014-2019
+version: 0.6.6
+current_version: 0.6.6
+release: 0.6.6
+copyright_year: 2014-2020
 branch: master
+is_on_conda: true
+setup_use_markers: true
+sphinx_extensions:
+  - sphinx.ext.autosummary
+  - sphinx.ext.autodoc
+  - sphinx.ext.doctest
+  - sphinx.ext.intersphinx
+  - sphinx.ext.viewcode
+  - sphinxcontrib.excel
 dependencies:
   - lml>=0.0.4
-  - pyexcel-io>=0.5.18
-  - texttable>=0.8.1;python_version<"3"
-  - texttable>=0.8.2;python_version>="3"
-  - ordereddict;python_version<"2.7"
-  - weakrefset;python_version<"2.7"
-  - lxml>=3.4.4;platform_python_implementation=="PyPy"
+  - pyexcel-io>=0.6.2
+  - texttable>=0.8.2
 extra_dependencies:
   - xls:
-    - pyexcel-xls>=0.5.0
+    - pyexcel-xls>=0.6.0
   - xlsx:
-    - pyexcel-xlsx>=0.5.0
+    - pyexcel-xlsx>=0.6.0
   - ods:
-    - pyexcel-ods3>=0.5.0
+    - pyexcel-ods3>=0.6.0
+test_dependencies:
+  - flask
+  - SQLAlchemy
+  - pyexcel-xlsx>=0.4.1
+  - pyexcel-xls>=0.4.1
+  - pyexcel-text>=0.2.0
+  - psutil
+  - pyexcel-pygal
 description: A wrapper library that provides one API to read, manipulate and write data in different excel formats
+python_requires: ">=3.6"
+min_python_version: "3.6"
+skip_readme: true
+moban_command: false
diff --git a/pyexcel/__version__.py b/pyexcel/__version__.py
index 7c3d1950..e39d32a8 100644
--- a/pyexcel/__version__.py
+++ b/pyexcel/__version__.py
@@ -1,2 +1,2 @@
-__version__ = "0.5.14"
-__author__ = "C.W."
+__version__ = '0.6.6'
+__author__ = 'chfw'
diff --git a/pyexcel/_compact.py b/pyexcel/_compact.py
index 7d3710f8..8bce61b9 100644
--- a/pyexcel/_compact.py
+++ b/pyexcel/_compact.py
@@ -17,40 +17,20 @@
 # pylint: disable=ungrouped-imports
 import sys
 import warnings
+from io import BytesIO, StringIO
+from urllib import request as request
 from textwrap import dedent
+from itertools import zip_longest
+from collections import OrderedDict
 
 PY2 = sys.version_info[0] == 2
 PY26 = PY2 and sys.version_info[1] < 7
 PY3_AND_ABOVE = sys.version_info[0] >= 3
 
-if PY26:
-    from ordereddict import OrderedDict
-else:
-    from collections import OrderedDict
-
-if PY2:
-    from StringIO import StringIO
-    from StringIO import StringIO as BytesIO
-    from itertools import izip_longest as zip_longest
-    from itertools import izip as czip
-    import urllib2 as request
-
-    class Iterator(object):
-        """Python 2 iterator"""
-
-        def next(self):
-            """Iterator interface get next value"""
-            return type(self).__next__(self)
-
-    irange = xrange
-else:
-    from io import StringIO, BytesIO
-    import urllib.request as request
-    from itertools import zip_longest
-
-    Iterator = object
-    irange = range
-    czip = zip
+
+Iterator = object
+irange = range
+czip = zip
 
 
 def is_tuple_consists_of_strings(an_array):
diff --git a/pyexcel/book.py b/pyexcel/book.py
index 3369a716..3c79245a 100644
--- a/pyexcel/book.py
+++ b/pyexcel/book.py
@@ -7,7 +7,7 @@
     :copyright: (c) 2014-2019 by Onni Software Ltd.
     :license: New BSD License, see LICENSE for more details
 """
-import pyexcel._compact as compact
+from pyexcel import _compact as compact
 from pyexcel.sheet import Sheet
 from pyexcel.internal.meta import BookMeta
 from pyexcel.internal.common import SheetIterator
@@ -40,8 +40,7 @@ class Book(BookMeta):
         self.init(sheets=sheets, filename=filename, path=path)
 
     def init(self, sheets=None, filename="memory", path=None):
-        """indpendent function so that it could be called multiple times
-        """
+        """indpendent function so that it could be called multiple times"""
         self.__path = path
         self.filename = filename
         self.load_from_sheets(sheets)
@@ -56,10 +55,6 @@ class Book(BookMeta):
         if sheets is None:
             return
         keys = sheets.keys()
-        if not isinstance(sheets, compact.OrderedDict):
-            # if the end user does not care about the order
-            # we put alphatical order
-            keys = sorted(keys)
         for name in keys:
             value = sheets[name]
             if isinstance(value, Sheet):
@@ -222,8 +217,7 @@ class Book(BookMeta):
 
 
 def to_book(bookstream):
-    """Convert a bookstream to Book
-    """
+    """Convert a bookstream to Book"""
     if isinstance(bookstream, Book):
         return bookstream
     else:
diff --git a/pyexcel/constants.py b/pyexcel/constants.py
index c3d2ce95..44de5c2c 100644
--- a/pyexcel/constants.py
+++ b/pyexcel/constants.py
@@ -4,7 +4,7 @@
 
     Constants appeared in pyexcel
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 # flake8: noqa
diff --git a/pyexcel/core.py b/pyexcel/core.py
index 66b86e27..5b4ad579 100644
--- a/pyexcel/core.py
+++ b/pyexcel/core.py
@@ -4,19 +4,19 @@
 
     A list of pyexcel signature functions
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 import re
 
-import pyexcel.constants as constants
-import pyexcel.docstrings as docs
-import pyexcel.internal.core as sources
+from pyexcel import constants as constants
+from pyexcel import docstrings as docs
 from pyexcel.book import Book, to_book
 from pyexcel.sheet import Sheet
 from pyexcel._compact import OrderedDict, append_doc, zip_longest
+from pyexcel.internal import core as sources
 
-import pyexcel_io.manager as manager
+from pyexcel_io import manager as manager
 
 STARTS_WITH_DEST = "^dest_(.*)"
 SAVE_AS_EXCEPTION = (
diff --git a/pyexcel/deprecated.py b/pyexcel/deprecated.py
index 487a2198..faed3562 100644
--- a/pyexcel/deprecated.py
+++ b/pyexcel/deprecated.py
@@ -4,7 +4,7 @@
 
     List of apis that become deprecated but was kept for backward compatibility
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 import warnings
@@ -198,8 +198,7 @@ def ColumnSeriesReader(file_name=None, sheetname=None, series=0, **keywords):
     message="Deprecated since v0.0.7! Please use class Book instead",
 )
 def BookReader(file_name, **keywords):
-    """For backward compatibility
-    """
+    """For backward compatibility"""
     return load_book(file_name, **keywords)
 
 
diff --git a/pyexcel/docstrings/__init__.py b/pyexcel/docstrings/__init__.py
index 4aec3479..986040f2 100644
--- a/pyexcel/docstrings/__init__.py
+++ b/pyexcel/docstrings/__init__.py
@@ -4,7 +4,7 @@
 
     Reusible docstrings
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 # flake8: noqa
diff --git a/pyexcel/docstrings/core.py b/pyexcel/docstrings/core.py
index 6d6a83a9..a874291d 100644
--- a/pyexcel/docstrings/core.py
+++ b/pyexcel/docstrings/core.py
@@ -4,7 +4,7 @@
 
     Reusible docstrings for pyexcel.core
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from . import keywords
diff --git a/pyexcel/docstrings/keywords.py b/pyexcel/docstrings/keywords.py
index b9b38fa8..52a9031e 100644
--- a/pyexcel/docstrings/keywords.py
+++ b/pyexcel/docstrings/keywords.py
@@ -4,7 +4,7 @@
 
     Reusible docstrings for keywords in signature functions
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 CSV_PARAMS = """
diff --git a/pyexcel/docstrings/meta.py b/pyexcel/docstrings/meta.py
index 249fff03..f049bf17 100644
--- a/pyexcel/docstrings/meta.py
+++ b/pyexcel/docstrings/meta.py
@@ -4,7 +4,7 @@
 
     Reusible docstrings for pyexcel.internal.meta
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from .keywords import CSV_PARAMS
diff --git a/pyexcel/exceptions.py b/pyexcel/exceptions.py
index 5e509b58..105afd8a 100644
--- a/pyexcel/exceptions.py
+++ b/pyexcel/exceptions.py
@@ -4,7 +4,7 @@
 
     Exceptions appeared in pyexcel
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 
diff --git a/pyexcel/ext/ods.py b/pyexcel/ext/ods.py
index ed99e644..2a70f580 100644
--- a/pyexcel/ext/ods.py
+++ b/pyexcel/ext/ods.py
@@ -4,7 +4,7 @@
 
     Deprecated module import
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from ..deprecated import deprecated_pyexcel_ext
diff --git a/pyexcel/ext/ods3.py b/pyexcel/ext/ods3.py
index bd912dac..c2b37dff 100644
--- a/pyexcel/ext/ods3.py
+++ b/pyexcel/ext/ods3.py
@@ -4,7 +4,7 @@
 
     Deprecated module import
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from ..deprecated import deprecated_pyexcel_ext
diff --git a/pyexcel/ext/text.py b/pyexcel/ext/text.py
index ae6b697c..facd3aa8 100644
--- a/pyexcel/ext/text.py
+++ b/pyexcel/ext/text.py
@@ -4,7 +4,7 @@
 
     Deprecated module import
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from ..deprecated import deprecated_pyexcel_ext
diff --git a/pyexcel/ext/xls.py b/pyexcel/ext/xls.py
index df5774b5..5268d4f0 100644
--- a/pyexcel/ext/xls.py
+++ b/pyexcel/ext/xls.py
@@ -4,7 +4,7 @@
 
     Deprecated module import
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from ..deprecated import deprecated_pyexcel_ext
diff --git a/pyexcel/ext/xlsx.py b/pyexcel/ext/xlsx.py
index 137c4e5c..6da167c1 100644
--- a/pyexcel/ext/xlsx.py
+++ b/pyexcel/ext/xlsx.py
@@ -4,7 +4,7 @@
 
     Deprecated module import
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from ..deprecated import deprecated_pyexcel_ext
diff --git a/pyexcel/internal/__init__.py b/pyexcel/internal/__init__.py
index 5daa6c9d..3fc36b4f 100644
--- a/pyexcel/internal/__init__.py
+++ b/pyexcel/internal/__init__.py
@@ -4,15 +4,14 @@
 
     Pyexcel internals that subjected to change
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
+from lml.loader import scan_plugins_regex
 from pyexcel.internal.plugins import PARSER, RENDERER  # noqa
 from pyexcel.internal.generators import BookStream, SheetStream  # noqa
 from pyexcel.internal.source_plugin import SOURCE  # noqa
 
-from lml.loader import scan_plugins_regex
-
 BLACK_LIST = [
     "pyexcel_io",
     "pyexcel_webio",
diff --git a/pyexcel/internal/attributes.py b/pyexcel/internal/attributes.py
index 32b6698e..dc32cd6e 100644
--- a/pyexcel/internal/attributes.py
+++ b/pyexcel/internal/attributes.py
@@ -4,10 +4,10 @@
 
     Book and sheet attributes
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
-import pyexcel.constants as constants
+from pyexcel import constants as constants
 
 ATTRIBUTE_REGISTRY = {
     constants.SHEET: {
diff --git a/pyexcel/internal/common.py b/pyexcel/internal/common.py
index b75945b2..6f69e70d 100644
--- a/pyexcel/internal/common.py
+++ b/pyexcel/internal/common.py
@@ -4,7 +4,7 @@
 
     Defintion for the shared objects
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 NO_COLUMN_NAMES = "Only sheet with column names is accepted"
diff --git a/pyexcel/internal/core.py b/pyexcel/internal/core.py
index 6a69d6ab..3b953be8 100644
--- a/pyexcel/internal/core.py
+++ b/pyexcel/internal/core.py
@@ -4,7 +4,7 @@
 
     elementary functions to read and write generic excel content
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel._compact import PY2
diff --git a/pyexcel/internal/garbagecollector.py b/pyexcel/internal/garbagecollector.py
index ebebbd6b..ac607977 100644
--- a/pyexcel/internal/garbagecollector.py
+++ b/pyexcel/internal/garbagecollector.py
@@ -4,10 +4,10 @@
 
     Simple garbage collector
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
-import pyexcel.docstrings as docs
+from pyexcel import docstrings as docs
 from pyexcel._compact import append_doc
 
 GARBAGE = []
diff --git a/pyexcel/internal/generators.py b/pyexcel/internal/generators.py
index e33a7de1..59926cce 100644
--- a/pyexcel/internal/generators.py
+++ b/pyexcel/internal/generators.py
@@ -4,7 +4,7 @@
 
     Defintion for the sheet and book generators.
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel._compact import OrderedDict
diff --git a/pyexcel/internal/meta.py b/pyexcel/internal/meta.py
index d3f8a612..16b134d7 100644
--- a/pyexcel/internal/meta.py
+++ b/pyexcel/internal/meta.py
@@ -4,14 +4,14 @@
 
     Annotate sheet and book class' attributes
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 import sys
 from functools import partial
 
-import pyexcel.constants as constants
-import pyexcel.docstrings as docs
+from pyexcel import constants as constants
+from pyexcel import docstrings as docs
 from pyexcel._compact import PY2, append_doc
 from pyexcel.internal import SOURCE
 from pyexcel.internal.core import save_book, save_sheet, get_sheet_stream
@@ -19,8 +19,7 @@ from pyexcel.internal.utils import make_a_property
 
 
 def make_presenter(source_getter, attribute=None):
-    """make a custom presentation method for each file types
-    """
+    """make a custom presentation method for each file types"""
 
     def custom_presenter(self, **keywords):
         """docstring is assigned a few lines down the line"""
@@ -42,22 +41,19 @@ def make_presenter(source_getter, attribute=None):
 
 
 def sheet_presenter(attribute=None):
-    """make a custom presentation method for sheet
-    """
+    """make a custom presentation method for sheet"""
     source_getter = SOURCE.get_writable_source
     return make_presenter(source_getter, attribute)
 
 
 def book_presenter(attribute=None):
-    """make a custom presentation method for book
-    """
+    """make a custom presentation method for book"""
     source_getter = SOURCE.get_writable_book_source
     return make_presenter(source_getter, attribute)
 
 
 def importer(attribute=None):
-    """make a custom input method for sheet
-    """
+    """make a custom input method for sheet"""
 
     def custom_importer1(self, content, **keywords):
         """docstring is assigned a few lines down the line"""
@@ -79,8 +75,7 @@ def importer(attribute=None):
 
 
 def book_importer(attribute=None):
-    """make a custom input method for book
-    """
+    """make a custom input method for book"""
 
     def custom_book_importer(self, content, **keywords):
         """docstring is assigned a few lines down the line"""
@@ -261,8 +256,7 @@ class SheetMeta(PyexcelObject):
 
     @append_doc(docs.SAVE_AS_OPTIONS)
     def save_as(self, filename, **keywords):
-        """Save the content to a named file
-        """
+        """Save the content to a named file"""
         return save_sheet(self, file_name=filename, **keywords)
 
     def save_to_memory(self, file_type, stream=None, **keywords):
diff --git a/pyexcel/internal/plugins.py b/pyexcel/internal/plugins.py
index 11d29821..7804e81b 100644
--- a/pyexcel/internal/plugins.py
+++ b/pyexcel/internal/plugins.py
@@ -4,22 +4,20 @@
 
     Renderer and parser plugin manager
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from lml.plugin import PluginManager
 
 
 class IOPluginManager(PluginManager):
-    """Generic plugin manager for renderer and parser
-    """
+    """Generic plugin manager for renderer and parser"""
 
     def __init__(self, name):
         PluginManager.__init__(self, name)
 
     def get_a_plugin(self, key, library=None):
-        """get a plugin to handle the file type
-        """
+        """get a plugin to handle the file type"""
         __file_type = None
         if key:
             __file_type = key.lower()
@@ -28,8 +26,7 @@ class IOPluginManager(PluginManager):
         return plugin_cls(__file_type)
 
     def get_all_file_types(self):
-        """get all supported file types
-        """
+        """get all supported file types"""
         file_types = list(self.registry.keys())
         return file_types
 
diff --git a/pyexcel/internal/sheets/_shared.py b/pyexcel/internal/sheets/_shared.py
index 13a68824..df7c457f 100644
--- a/pyexcel/internal/sheets/_shared.py
+++ b/pyexcel/internal/sheets/_shared.py
@@ -4,7 +4,7 @@
 
     Locally shared utility functions
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 import re
@@ -28,7 +28,7 @@ class CommonPropertyAmongRowNColumn(object):
         raise NotImplementedError("Not implemented")
 
     def __add__(self, other):
-        """Overload += sign
+        """Overload + sign
 
         :return: self
         """
@@ -47,8 +47,7 @@ class CommonPropertyAmongRowNColumn(object):
 
 
 def analyse_slice(aslice, upper_bound):
-    """An internal function to analyze a given slice
-    """
+    """An internal function to analyze a given slice"""
     if aslice.start is None:
         start = 0
     else:
diff --git a/pyexcel/internal/sheets/column.py b/pyexcel/internal/sheets/column.py
index 55b0a6aa..71a6fc89 100644
--- a/pyexcel/internal/sheets/column.py
+++ b/pyexcel/internal/sheets/column.py
@@ -4,12 +4,13 @@
 
     Generic table column
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
+import copy
 import types
 
-import pyexcel._compact as compact
+from pyexcel import _compact as compact
 
 from . import _shared as utils
 
@@ -250,23 +251,35 @@ class Column(utils.CommonPropertyAmongRowNColumn):
         :return: self
         """
         if isinstance(other, compact.OrderedDict):
-            self._ref.extend_columns(other)
+            self._ref.extend_columns(copy.deepcopy(other))
         elif isinstance(other, list):
-            self._ref.extend_columns(other)
+            self._ref.extend_columns(copy.deepcopy(other))
         elif hasattr(other, "get_internal_array"):
-            self._ref.extend_columns_with_rows(other.get_internal_array())
+            self._ref.extend_columns_with_rows(
+                copy.deepcopy(other.get_internal_array())
+            )
         else:
             raise TypeError
 
         return self
 
     def __add__(self, other):
-        """Overload += sign
-
-        :return: self
+        """Overload + sign
+        :return: new instance
         """
-        self.__iadd__(other)
-        return self._ref
+        new_instance = self._ref.clone()
+        if isinstance(other, compact.OrderedDict):
+            new_instance.extend_columns(copy.deepcopy(other))
+        elif isinstance(other, list):
+            new_instance.extend_columns(copy.deepcopy(other))
+        elif hasattr(other, "get_internal_array"):
+            new_instance.extend_columns_with_rows(
+                copy.deepcopy(other.get_internal_array())
+            )
+        else:
+            raise TypeError
+
+        return new_instance
 
     def __getattr__(self, attr):
         """
@@ -281,8 +294,7 @@ class Column(utils.CommonPropertyAmongRowNColumn):
         return self._ref.named_column_at(the_attr)
 
     def format(self, column_index=None, formatter=None, format_specs=None):
-        """Format a column
-        """
+        """Format a column"""
         if column_index is not None:
             self._handle_one_formatter(column_index, formatter)
         elif format_specs:
diff --git a/pyexcel/internal/sheets/formatters.py b/pyexcel/internal/sheets/formatters.py
index baff67a4..43f25d99 100644
--- a/pyexcel/internal/sheets/formatters.py
+++ b/pyexcel/internal/sheets/formatters.py
@@ -11,7 +11,7 @@ import json
 import datetime
 from decimal import Decimal
 
-import pyexcel.constants as constants
+from pyexcel import constants as constants
 from pyexcel._compact import PY2
 
 
diff --git a/pyexcel/internal/sheets/matrix.py b/pyexcel/internal/sheets/matrix.py
index 7cd3df33..7ad8c4d3 100644
--- a/pyexcel/internal/sheets/matrix.py
+++ b/pyexcel/internal/sheets/matrix.py
@@ -13,8 +13,8 @@ import types
 from functools import partial
 from itertools import chain
 
-import pyexcel._compact as compact
-import pyexcel.constants as constants
+from pyexcel import _compact as compact
+from pyexcel import constants as constants
 from pyexcel.internal.meta import SheetMeta
 from pyexcel.internal.sheets.row import Row
 from pyexcel.internal.sheets.column import Column
@@ -82,18 +82,18 @@ class Matrix(SheetMeta):
         :param int column: column index which starts from 0
         :param any new_value: new value if this is to set the value
         """
-        if row < self.number_of_rows() and column < self.number_of_columns():
-            if new_value is None:
-                # get
+        fit = row < self.number_of_rows() and column < self.number_of_columns()
+        if new_value is None:
+            if fit:
                 return self.__array[row][column]
             else:
-                # set
-                self.__array[row][column] = new_value
-        else:
-            if new_value is None:
                 raise IndexError("Index out of range")
-            else:
-                self.paste((row, column), [[new_value]])
+        else:
+            if not fit:
+                width, array = uniform(self.__array, row+1, column+1)
+                self.__width, self.__array = width, array
+
+            self.__array[row][column] = new_value
 
     def row_at(self, index):
         """
@@ -111,8 +111,7 @@ class Matrix(SheetMeta):
             raise IndexError(constants.MESSAGE_INDEX_OUT_OF_RANGE)
 
     def set_row_at(self, row_index, data_array):
-        """Update a row data range
-        """
+        """Update a row data range"""
         nrows = self.number_of_rows()
         if row_index < nrows:
             self.__array[row_index] = data_array
@@ -449,8 +448,7 @@ class Matrix(SheetMeta):
         self.__width, self.__array = uniform(self.__array)
 
     def delete_columns(self, column_indices):
-        """Delete columns by specified list of indices
-        """
+        """Delete columns by specified list of indices"""
         if isinstance(column_indices, list) is False:
             raise TypeError(constants.MESSAGE_DATA_ERROR_DATA_TYPE_MISMATCH)
         if len(column_indices) > 0:
@@ -502,8 +500,7 @@ class Matrix(SheetMeta):
         self.__width, self.__array = uniform(self.__array)
 
     def to_array(self):
-        """Get an array out
-        """
+        """Get an array out"""
         return self.__array
 
     def __iter__(self):
@@ -762,36 +759,18 @@ class Matrix(SheetMeta):
                 value = custom_function(value)
                 self.cell_value(row, column, value)
 
+    def __iadd__(self, other):
+        return _add(self.name, self.__array, other)
+
     def __add__(self, other):
         """Overload the + sign
 
         :returns: a new book
         """
-        from pyexcel.book import Book, local_uuid
-
-        content = {}
-        content[self.name] = self.__array
-        if isinstance(other, Book):
-            other_in_dict = other.to_dict()
-            for key in other_in_dict.keys():
-                new_key = key
-                if len(other_in_dict.keys()) == 1:
-                    new_key = other.filename
-                if new_key in content:
-                    uid = local_uuid()
-                    new_key = "%s_%s" % (key, uid)
-                content[new_key] = other_in_dict[key]
-        elif isinstance(other, Matrix):
-            new_key = other.name
-            if new_key in content:
-                uid = local_uuid()
-                new_key = "%s_%s" % (other.name, uid)
-            content[new_key] = other.get_internal_array()
-        else:
-            raise TypeError
-        new_book = Book()
-        new_book.load_from_sheets(content)
-        return new_book
+        return _add(self.name, copy.deepcopy(self.__array), other)
+
+    def clone(self):
+        return Matrix(copy.deepcopy(self.__array))
 
 
 def _unique(seq):
@@ -818,12 +797,17 @@ def longest_row_number(array):
         return 0
 
 
-def uniform(array):
+def uniform(array, min_rows=0, min_columns=0):
     """Fill-in empty strings to empty cells to make it MxN
 
     :param list in_array: a list of arrays
+    :param int row_no: desired minimum row count
+    :param int column_no: desired minimum column length
     """
-    width = longest_row_number(array)
+    width = max(min_columns, longest_row_number(array))
+    array_length = len(array)
+    height = max(array_length, min_rows)
+
     if width == 0:
         return 0, array
     else:
@@ -834,6 +818,9 @@ def uniform(array):
                     row[index] = constants.DEFAULT_NA
             if row_length < width:
                 row += [constants.DEFAULT_NA] * (width - row_length)
+        for _ in range(array_length, height):
+            row = [constants.DEFAULT_NA] * width
+            array.append(row)
         return width, array
 
 
@@ -861,3 +848,31 @@ def transpose(in_array):
                 row_data.append(constants.DEFAULT_NA)
         new_array.append(row_data)
     return new_array
+
+
+def _add(name, left, right):
+    from pyexcel.book import Book, local_uuid
+
+    content = {}
+    content[name] = left
+    if isinstance(right, Book):
+        right_in_dict = copy.deepcopy(right.to_dict())
+        for key in right_in_dict.keys():
+            new_key = key
+            if len(right_in_dict.keys()) == 1:
+                new_key = right.filename
+            if new_key in content:
+                uid = local_uuid()
+                new_key = "%s_%s" % (key, uid)
+            content[new_key] = right_in_dict[key]
+    elif isinstance(right, Matrix):
+        new_key = right.name
+        if new_key in content:
+            uid = local_uuid()
+            new_key = "%s_%s" % (right.name, uid)
+        content[new_key] = copy.deepcopy(right.get_internal_array())
+    else:
+        raise TypeError
+    new_book = Book()
+    new_book.load_from_sheets(content)
+    return new_book
diff --git a/pyexcel/internal/sheets/row.py b/pyexcel/internal/sheets/row.py
index 7485ea60..007bf576 100644
--- a/pyexcel/internal/sheets/row.py
+++ b/pyexcel/internal/sheets/row.py
@@ -4,12 +4,13 @@
 
     Generic table row
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
+import copy
 import types
 
-import pyexcel._compact as compact
+from pyexcel import _compact as compact
 
 from . import _shared as utils
 
@@ -210,18 +211,33 @@ class Row(utils.CommonPropertyAmongRowNColumn):
         :return: self
         """
         if isinstance(other, compact.OrderedDict):
-            self._ref.extend_rows(other)
+            self._ref.extend_rows(copy.deepcopy(other))
         elif isinstance(other, list):
-            self._ref.extend_rows(other)
+            self._ref.extend_rows(copy.deepcopy(other))
         elif hasattr(other, "get_internal_array"):
-            self._ref.extend_rows(other.get_internal_array())
+            self._ref.extend_rows(copy.deepcopy(other.get_internal_array()))
         else:
             raise TypeError
         return self
 
-    def format(self, row_index=None, formatter=None, format_specs=None):
-        """Format a row
+    def __add__(self, other):
+        """Overload + sign
+
+        :return: new instance
         """
+        new_instance = self._ref.clone()
+        if isinstance(other, compact.OrderedDict):
+            new_instance.extend_rows(copy.deepcopy(other))
+        elif isinstance(other, list):
+            new_instance.extend_rows(copy.deepcopy(other))
+        elif hasattr(other, "get_internal_array"):
+            new_instance.extend_rows(copy.deepcopy(other.get_internal_array()))
+        else:
+            raise TypeError
+        return new_instance
+
+    def format(self, row_index=None, formatter=None, format_specs=None):
+        """Format a row"""
         if row_index is not None:
             self._handle_one_formatter(row_index, formatter)
         elif format_specs:
diff --git a/pyexcel/internal/source_plugin.py b/pyexcel/internal/source_plugin.py
index cca23d7a..93399b4b 100644
--- a/pyexcel/internal/source_plugin.py
+++ b/pyexcel/internal/source_plugin.py
@@ -4,18 +4,18 @@
 
     Second level abstraction
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
-import pyexcel.constants as constants
-import pyexcel.exceptions as exceptions
+from pyexcel import constants as constants
+from pyexcel import exceptions as exceptions
+from lml.plugin import PluginManager
 from pyexcel.internal.attributes import (
     register_book_attribute,
     register_sheet_attribute,
 )
 
-import pyexcel_io.constants as io_constants
-from lml.plugin import PluginManager
+from pyexcel_io import constants as io_constants
 
 REGISTRY_KEY_FORMAT = "%s-%s"
 # ignore the following attributes
@@ -60,7 +60,7 @@ class SourcePluginManager(PluginManager):
     def get_a_plugin(
         self, target=None, action=None, source_library=None, **keywords
     ):
-        """obtain a source plugin for pyexcel signature functions"""
+        """obtain a source plugin for signature functions"""
         key = REGISTRY_KEY_FORMAT % (target, action)
         io_library = None
         # backward support pyexcel-io library parameter
@@ -75,26 +75,25 @@ class SourcePluginManager(PluginManager):
         return source_instance
 
     def get_source(self, **keywords):
-        """obtain a sheet read source plugin for pyexcel signature functions"""
+        """obtain a sheet read source plugin for signature functions"""
         return self.get_a_plugin(
             target=constants.SHEET, action=constants.READ_ACTION, **keywords
         )
 
     def get_book_source(self, **keywords):
-        """obtain a book read source plugin for pyexcel signature functions"""
+        """obtain a book read source plugin for signature functions"""
         return self.get_a_plugin(
             target=constants.BOOK, action=constants.READ_ACTION, **keywords
         )
 
     def get_writable_source(self, **keywords):
-        """obtain a sheet write source plugin for pyexcel signature functions
-        """
+        """obtain a sheet write source plugin for signature functions"""
         return self.get_a_plugin(
             target=constants.SHEET, action=constants.WRITE_ACTION, **keywords
         )
 
     def get_writable_book_source(self, **keywords):
-        """obtain a book write source plugin for pyexcel signature functions"""
+        """obtain a book write source plugin for signature functions"""
         return self.get_a_plugin(
             target=constants.BOOK, action=constants.WRITE_ACTION, **keywords
         )
diff --git a/pyexcel/parser.py b/pyexcel/parser.py
index 55f580c5..5dbf7f95 100644
--- a/pyexcel/parser.py
+++ b/pyexcel/parser.py
@@ -4,10 +4,10 @@
 
     Extract tabular data from external file, stream or content
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
-import pyexcel.internal.garbagecollector as gc
+from pyexcel.internal import garbagecollector as gc
 
 
 class AbstractParser(object):
diff --git a/pyexcel/plugins/__init__.py b/pyexcel/plugins/__init__.py
index ae7beb35..2ce66909 100644
--- a/pyexcel/plugins/__init__.py
+++ b/pyexcel/plugins/__init__.py
@@ -4,19 +4,18 @@
 
     Public interface for plugins
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 import types
 from itertools import product
 
-import pyexcel.constants as constants
+from pyexcel import constants as constants
+from lml.plugin import PluginInfo, PluginInfoChain
 from pyexcel._compact import is_string
 from pyexcel.exceptions import FileTypeNotSupported
 from pyexcel.internal.plugins import PARSER, RENDERER
 
-from lml.plugin import PluginInfo, PluginInfoChain
-
 
 class SourceInfo(PluginInfo):
     """Plugin description for a source"""
@@ -133,8 +132,7 @@ class IOPluginInfo(PluginInfo):
 
 
 class PyexcelPluginChain(PluginInfoChain):
-    """It is used by pyexcel plugins
-    """
+    """It is used by pyexcel plugins"""
 
     def add_a_source(self, relative_plugin_class_path=None, **keywords):
         """
diff --git a/pyexcel/plugins/parsers/__init__.py b/pyexcel/plugins/parsers/__init__.py
index a032a374..feaebe30 100644
--- a/pyexcel/plugins/parsers/__init__.py
+++ b/pyexcel/plugins/parsers/__init__.py
@@ -4,7 +4,7 @@
 
     A list of built-in parsers
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.plugins import PyexcelPluginChain
diff --git a/pyexcel/plugins/parsers/django.py b/pyexcel/plugins/parsers/django.py
index a8d4d94d..18d14a07 100644
--- a/pyexcel/plugins/parsers/django.py
+++ b/pyexcel/plugins/parsers/django.py
@@ -4,13 +4,13 @@
 
     Export data into database datables
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.parser import DbParser
 
-import pyexcel_io.database.common as django
 from pyexcel_io import get_data, iget_data
+from pyexcel_io.database import common as django
 
 
 class DjangoExporter(DbParser):
diff --git a/pyexcel/plugins/parsers/excel.py b/pyexcel/plugins/parsers/excel.py
index 1d82a7c0..0944743a 100644
--- a/pyexcel/plugins/parsers/excel.py
+++ b/pyexcel/plugins/parsers/excel.py
@@ -4,7 +4,7 @@
 
     Parsing excel sources
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.parser import AbstractParser
diff --git a/pyexcel/plugins/parsers/sqlalchemy.py b/pyexcel/plugins/parsers/sqlalchemy.py
index f79f607b..99e4f0da 100644
--- a/pyexcel/plugins/parsers/sqlalchemy.py
+++ b/pyexcel/plugins/parsers/sqlalchemy.py
@@ -4,13 +4,13 @@
 
     Export data into database datables
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.parser import DbParser
 
-import pyexcel_io.database.common as sql
 from pyexcel_io import get_data, iget_data
+from pyexcel_io.database import common as sql
 
 
 class SQLAlchemyExporter(DbParser):
diff --git a/pyexcel/plugins/renderers/__init__.py b/pyexcel/plugins/renderers/__init__.py
index d3a371a7..98ff69ca 100644
--- a/pyexcel/plugins/renderers/__init__.py
+++ b/pyexcel/plugins/renderers/__init__.py
@@ -4,7 +4,7 @@
 
     A list of built-in renderers
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.plugins import PyexcelPluginChain
diff --git a/pyexcel/plugins/renderers/_texttable.py b/pyexcel/plugins/renderers/_texttable.py
index 519434da..68b753af 100644
--- a/pyexcel/plugins/renderers/_texttable.py
+++ b/pyexcel/plugins/renderers/_texttable.py
@@ -5,17 +5,16 @@
     Export data into texttable format. It also serves the default
     presentation of pyexcel sheet and book.
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from types import GeneratorType
 
-import pyexcel.constants as constants
+from pyexcel import constants as constants
+from texttable import Texttable
 from pyexcel.renderer import Renderer
 from pyexcel.internal.sheets.formatters import to_format
 
-from texttable import Texttable
-
 
 class TextTableRenderer(Renderer):
     """Default texttable presetation"""
diff --git a/pyexcel/plugins/renderers/django.py b/pyexcel/plugins/renderers/django.py
index 2559a81c..bf8b4233 100644
--- a/pyexcel/plugins/renderers/django.py
+++ b/pyexcel/plugins/renderers/django.py
@@ -4,15 +4,15 @@
 
     Export data into django models
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
-import pyexcel.internal.common as common
 from pyexcel._compact import OrderedDict
+from pyexcel.internal import common as common
 from pyexcel.renderer import DbRenderer
 
-import pyexcel_io.database.common as django
 from pyexcel_io import save_data
+from pyexcel_io.database import common as django
 
 NO_COLUMN_NAMES = "Only sheet with column names is accepted"
 
diff --git a/pyexcel/plugins/renderers/excel.py b/pyexcel/plugins/renderers/excel.py
index 8d0db040..b5f6252e 100644
--- a/pyexcel/plugins/renderers/excel.py
+++ b/pyexcel/plugins/renderers/excel.py
@@ -4,13 +4,13 @@
 
     Export data into excel files
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.renderer import AbstractRenderer
 from pyexcel.constants import DEFAULT_SHEET_NAME
 
-import pyexcel_io.manager as manager
+from pyexcel_io import manager as manager
 from pyexcel_io import save_data
 
 
diff --git a/pyexcel/plugins/renderers/sqlalchemy.py b/pyexcel/plugins/renderers/sqlalchemy.py
index 715255ae..8ee4fa66 100644
--- a/pyexcel/plugins/renderers/sqlalchemy.py
+++ b/pyexcel/plugins/renderers/sqlalchemy.py
@@ -4,15 +4,15 @@
 
     Export data into database datables
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
-import pyexcel.internal.common as common
 from pyexcel._compact import OrderedDict
+from pyexcel.internal import common as common
 from pyexcel.renderer import DbRenderer
 
-import pyexcel_io.database.common as sql
 from pyexcel_io import save_data
+from pyexcel_io.database import common as sql
 
 
 class SQLAlchemyRenderer(DbRenderer):
diff --git a/pyexcel/plugins/sources/__init__.py b/pyexcel/plugins/sources/__init__.py
index 065a2b00..fa989fc3 100644
--- a/pyexcel/plugins/sources/__init__.py
+++ b/pyexcel/plugins/sources/__init__.py
@@ -4,7 +4,7 @@
 
     A list of built-in sources
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.plugins import PyexcelPluginChain
diff --git a/pyexcel/plugins/sources/db_sources.py b/pyexcel/plugins/sources/db_sources.py
index e5460596..f3125c73 100644
--- a/pyexcel/plugins/sources/db_sources.py
+++ b/pyexcel/plugins/sources/db_sources.py
@@ -4,7 +4,7 @@
 
     Generic database sources
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.source import AbstractSource
diff --git a/pyexcel/plugins/sources/django.py b/pyexcel/plugins/sources/django.py
index 081ba15e..054b4d7d 100644
--- a/pyexcel/plugins/sources/django.py
+++ b/pyexcel/plugins/sources/django.py
@@ -4,7 +4,7 @@
 
     Representation of django sources
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel_io.constants import DB_DJANGO
diff --git a/pyexcel/plugins/sources/file_input.py b/pyexcel/plugins/sources/file_input.py
index a35d25b0..49430534 100644
--- a/pyexcel/plugins/sources/file_input.py
+++ b/pyexcel/plugins/sources/file_input.py
@@ -4,7 +4,7 @@
 
     Representation of input file sources
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 import os
@@ -15,8 +15,7 @@ from pyexcel.internal import PARSER
 
 # pylint: disable=W0223
 class ReadExcelFromFile(AbstractSource):
-    """Pick up 'file_name' field and do single sheet based read and write
-    """
+    """Pick up 'file_name' field and do single sheet based read and write"""
 
     def __init__(self, file_name=None, parser_library=None, **keywords):
         self.__file_name = file_name
diff --git a/pyexcel/plugins/sources/file_output.py b/pyexcel/plugins/sources/file_output.py
index 289f23b7..e81a1815 100644
--- a/pyexcel/plugins/sources/file_output.py
+++ b/pyexcel/plugins/sources/file_output.py
@@ -4,7 +4,7 @@
 
     Representation of output file sources
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.source import AbstractSource
@@ -14,8 +14,7 @@ from pyexcel.internal import RENDERER
 
 # pylint: disable=W0223
 class WriteSheetToFile(AbstractSource):
-    """Pick up 'file_name' field and do single sheet based read and write
-    """
+    """Pick up 'file_name' field and do single sheet based read and write"""
 
     def __init__(self, file_name=None, renderer_library=None, **keywords):
         AbstractSource.__init__(self, **keywords)
@@ -36,8 +35,7 @@ class WriteSheetToFile(AbstractSource):
 
 # pylint: disable=W0223
 class WriteBookToFile(WriteSheetToFile):
-    """Pick up 'file_name' field and do multiple sheet based read and write
-    """
+    """Pick up 'file_name' field and do multiple sheet based read and write"""
 
     def write_data(self, book):
         self._renderer.render_book_to_file(
diff --git a/pyexcel/plugins/sources/http.py b/pyexcel/plugins/sources/http.py
index 254836bf..c90f2670 100644
--- a/pyexcel/plugins/sources/http.py
+++ b/pyexcel/plugins/sources/http.py
@@ -4,10 +4,10 @@
 
     Representation of http sources
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
-import pyexcel.constants as constants
+from pyexcel import constants as constants
 from pyexcel.source import AbstractSource
 from pyexcel._compact import PY2, request
 from pyexcel.internal import PARSER
@@ -55,7 +55,8 @@ class HttpSource(AbstractSource):
             file_type = _get_file_type_from_url(self.__url)
         parser_library = self._keywords.get("parser_library", None)
         aparser = PARSER.get_a_plugin(file_type, parser_library)
-        sheets = aparser.parse_file_stream(connection, **self._keywords)
+        content = connection.read()
+        sheets = aparser.parse_file_content(content, **self._keywords)
         return sheets
 
     def get_source_info(self):
diff --git a/pyexcel/plugins/sources/memory_input.py b/pyexcel/plugins/sources/memory_input.py
index 9b50ecd8..e2035108 100644
--- a/pyexcel/plugins/sources/memory_input.py
+++ b/pyexcel/plugins/sources/memory_input.py
@@ -4,7 +4,7 @@
 
     Representation of input file sources
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.source import AbstractSource
diff --git a/pyexcel/plugins/sources/output_to_memory.py b/pyexcel/plugins/sources/output_to_memory.py
index 0a373449..d6daa453 100644
--- a/pyexcel/plugins/sources/output_to_memory.py
+++ b/pyexcel/plugins/sources/output_to_memory.py
@@ -4,7 +4,7 @@
 
     Representation of output file sources
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.source import AbstractSource, MemorySourceMixin
diff --git a/pyexcel/plugins/sources/params.py b/pyexcel/plugins/sources/params.py
index e3af7223..bba5ec30 100644
--- a/pyexcel/plugins/sources/params.py
+++ b/pyexcel/plugins/sources/params.py
@@ -4,7 +4,7 @@
 
     Local magic workds
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 # keywords
diff --git a/pyexcel/plugins/sources/pydata/arraysource.py b/pyexcel/plugins/sources/pydata/arraysource.py
index 6fa7a57b..1c9da4ab 100644
--- a/pyexcel/plugins/sources/pydata/arraysource.py
+++ b/pyexcel/plugins/sources/pydata/arraysource.py
@@ -4,7 +4,7 @@
 
     Representation of array source
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.source import AbstractSource, MemorySourceMixin
diff --git a/pyexcel/plugins/sources/pydata/bookdict.py b/pyexcel/plugins/sources/pydata/bookdict.py
index cf691ae0..de7b30ec 100644
--- a/pyexcel/plugins/sources/pydata/bookdict.py
+++ b/pyexcel/plugins/sources/pydata/bookdict.py
@@ -4,7 +4,7 @@
 
     Representation of book dict source
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.source import AbstractSource, MemorySourceMixin
diff --git a/pyexcel/plugins/sources/pydata/common.py b/pyexcel/plugins/sources/pydata/common.py
index 7e2df22c..9de5bd99 100644
--- a/pyexcel/plugins/sources/pydata/common.py
+++ b/pyexcel/plugins/sources/pydata/common.py
@@ -4,10 +4,10 @@
 
     Representation of array, dict, records and book dict sources
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
-import pyexcel.constants as constants
+from pyexcel import constants as constants
 from pyexcel._compact import PY2, OrderedDict, zip_longest
 
 from pyexcel_io.sheet import SheetReader
diff --git a/pyexcel/plugins/sources/pydata/dictsource.py b/pyexcel/plugins/sources/pydata/dictsource.py
index 10dc31eb..b32188f9 100644
--- a/pyexcel/plugins/sources/pydata/dictsource.py
+++ b/pyexcel/plugins/sources/pydata/dictsource.py
@@ -4,7 +4,7 @@
 
     Representation of dict sources
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.source import AbstractSource, MemorySourceMixin
diff --git a/pyexcel/plugins/sources/pydata/records.py b/pyexcel/plugins/sources/pydata/records.py
index a5c9d985..3ecd181f 100644
--- a/pyexcel/plugins/sources/pydata/records.py
+++ b/pyexcel/plugins/sources/pydata/records.py
@@ -4,7 +4,7 @@
 
     Representation of records source
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.source import AbstractSource, MemorySourceMixin
diff --git a/pyexcel/plugins/sources/querysets.py b/pyexcel/plugins/sources/querysets.py
index ca0663ea..423320ce 100644
--- a/pyexcel/plugins/sources/querysets.py
+++ b/pyexcel/plugins/sources/querysets.py
@@ -4,13 +4,14 @@
 
     Representation of querysets
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
-import pyexcel.constants as constants
+from pyexcel import constants as constants
 from pyexcel.source import AbstractSource
 
-from pyexcel_io.database.querysets import QuerysetsReader
+from pyexcel_io import get_data
+from pyexcel_io.constants import DB_QUERYSET
 from . import params
 
 
@@ -67,8 +68,11 @@ class SheetQuerySetSource(AbstractSource):
         )
         if self.__skip_row_func is not None:
             local_params["skip_row_func"] = self.__skip_row_func
-        reader = QuerysetsReader(
-            self.__query_sets, self.__column_names, **local_params
+
+        data = get_data(
+            self.__query_sets,
+            file_type=DB_QUERYSET,
+            column_names=self.__column_names,
+            **local_params
         )
-        data = reader.to_array()
-        return {self.__sheet_name: data}
+        return data
diff --git a/pyexcel/plugins/sources/sheet_stream_source.py b/pyexcel/plugins/sources/sheet_stream_source.py
index 0657db39..94dc9a56 100644
--- a/pyexcel/plugins/sources/sheet_stream_source.py
+++ b/pyexcel/plugins/sources/sheet_stream_source.py
@@ -4,7 +4,7 @@
 
     Representation of array source
 
-    :copyright: (c) 2015-2018 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel.source import AbstractSource, MemorySourceMixin
diff --git a/pyexcel/plugins/sources/sqlalchemy.py b/pyexcel/plugins/sources/sqlalchemy.py
index 5da45363..242f31c1 100644
--- a/pyexcel/plugins/sources/sqlalchemy.py
+++ b/pyexcel/plugins/sources/sqlalchemy.py
@@ -4,7 +4,7 @@
 
     Representation of sqlalchemy sources
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
 from pyexcel_io.constants import DB_SQL
diff --git a/pyexcel/renderer.py b/pyexcel/renderer.py
index ce5cf79b..f1ea5cbc 100644
--- a/pyexcel/renderer.py
+++ b/pyexcel/renderer.py
@@ -4,10 +4,10 @@
 
     Renders pyexcel.Book and pyexcel.Sheet to any format
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
-import pyexcel._compact as compact
+from pyexcel import _compact as compact
 
 
 class AbstractRenderer(object):
diff --git a/pyexcel/sheet.py b/pyexcel/sheet.py
index ee5e2fc7..3c8420ba 100644
--- a/pyexcel/sheet.py
+++ b/pyexcel/sheet.py
@@ -9,8 +9,9 @@
 """
 from collections import defaultdict
 
-import pyexcel._compact as compact
-import pyexcel.constants as constants
+from pyexcel import _compact as compact
+from pyexcel import constants as constants
+from pyexcel._compact import OrderedDict
 from pyexcel.internal.sheets.row import Row as NamedRow
 from pyexcel.internal.sheets.column import Column as NamedColumn
 from pyexcel.internal.sheets.matrix import Matrix
@@ -81,7 +82,8 @@ class Sheet(Matrix):
         """
         self.__column_names = []
         self.__row_names = []
-        self.__row_index = 0
+        self.__row_index = -1
+        self.__column_index = -1
         self.init(
             sheet=sheet,
             name=name,
@@ -161,6 +163,16 @@ class Sheet(Matrix):
         if transpose_after:
             self.transpose()
 
+    def clone(self):
+        import copy
+
+        new_sheet = Sheet(
+            copy.deepcopy(self.get_internal_array()),
+            name_columns_by_row=self.__row_index,
+            name_rows_by_column=self.__column_index,
+        )
+        return new_sheet
+
     def transpose(self):
         self.__column_names, self.__row_names = (
             self.__row_names,
@@ -184,6 +196,7 @@ class Sheet(Matrix):
         The specified column will be deleted from the data
         :param column_index: the index of the column that has the row names
         """
+        self.__column_index = column_index
         self.__row_names = make_names_unique(self.column_at(column_index))
         del self.column[column_index]
 
@@ -464,6 +477,68 @@ class Sheet(Matrix):
         else:
             raise ValueError(constants.MESSAGE_DATA_ERROR_NO_SERIES)
 
+    def project(self, new_ordered_columns, exclusion=False):
+        """
+        Rearrange the sheet.
+
+        :ivar new_ordered_columns: new columns
+        :ivar exclusion: to exlucde named column or not. defaults to False
+
+        Example::
+
+           >>> sheet = Sheet(
+           ... [["A", "B", "C"], [1, 2, 3], [11, 22, 33], [111, 222, 333]],
+           ... name_columns_by_row=0)
+           >>> sheet.project(["B", "A", "C"])
+           pyexcel sheet:
+           +-----+-----+-----+
+           |  B  |  A  |  C  |
+           +=====+=====+=====+
+           | 2   | 1   | 3   |
+           +-----+-----+-----+
+           | 22  | 11  | 33  |
+           +-----+-----+-----+
+           | 222 | 111 | 333 |
+           +-----+-----+-----+
+           >>> sheet.project(["B", "C"])
+           pyexcel sheet:
+           +-----+-----+
+           |  B  |  C  |
+           +=====+=====+
+           | 2   | 3   |
+           +-----+-----+
+           | 22  | 33  |
+           +-----+-----+
+           | 222 | 333 |
+           +-----+-----+
+           >>> sheet.project(["B", "C"], exclusion=True)
+           pyexcel sheet:
+           +-----+
+           |  A  |
+           +=====+
+           | 1   |
+           +-----+
+           | 11  |
+           +-----+
+           | 111 |
+           +-----+
+
+        """
+        from pyexcel import get_array
+
+        the_dict = self.to_dict()
+        new_dict = OrderedDict()
+        if exclusion:
+            for column in the_dict.keys():
+                if column not in new_ordered_columns:
+                    new_dict[column] = the_dict[column]
+        else:
+            for column in new_ordered_columns:
+                new_dict[column] = the_dict[column]
+
+        array = get_array(adict=new_dict)
+        return Sheet(array, name=self.name, name_columns_by_row=0)
+
     def to_dict(self, row=False):
         """Returns a dictionary"""
         the_dict = compact.OrderedDict()
@@ -557,6 +632,7 @@ def make_names_unique(alist):
     for item in alist:
         if not compact.is_string(type(item)):
             item = str(item)
+        item = item.strip()
         if item in duplicates:
             duplicates[item] = duplicates[item] + 1
             new_names.append("%s-%d" % (item, duplicates[item]))
diff --git a/pyexcel/source.py b/pyexcel/source.py
index 5b2c589d..e1138388 100644
--- a/pyexcel/source.py
+++ b/pyexcel/source.py
@@ -4,10 +4,10 @@
 
     Generic data source definition
 
-    :copyright: (c) 2015-2017 by Onni Software Ltd.
+    :copyright: (c) 2015-2020 by Onni Software Ltd.
     :license: New BSD License
 """
-import pyexcel.constants as constants
+from pyexcel import constants as constants
 
 
 class AbstractSource(object):
diff --git a/requirements.txt b/requirements.txt
index b2343352..8f0cd800 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,3 @@
 lml>=0.0.4
-pyexcel-io>=0.5.18
-texttable>=0.8.1;python_version<"3"
-texttable>=0.8.2;python_version>="3"
-ordereddict;python_version<"2.7"
-weakrefset;python_version<"2.7"
-lxml>=3.4.4;platform_python_implementation=="PyPy"
+pyexcel-io>=0.6.2
+texttable>=0.8.2
diff --git a/rnd_requirements.txt b/rnd_requirements.txt
index 6af14ae4..e69de29b 100644
--- a/rnd_requirements.txt
+++ b/rnd_requirements.txt
@@ -1,2 +0,0 @@
-https://github.com/pyexcel-renderers/pyexcel-pygal/archive/master.zip
-https://github.com/pyexcel/pyexcel-io/archive/master.zip
diff --git a/setup.py b/setup.py
index 0b7e8749..14bb282a 100644
--- a/setup.py
+++ b/setup.py
@@ -1,9 +1,11 @@
 #!/usr/bin/env python3
 
+"""
+Template by pypi-mobans
+"""
+
 import os
 import sys
-
-# Template by pypi-mobans
 import codecs
 import locale
 import platform
@@ -29,71 +31,70 @@ except (ValueError, UnicodeError, locale.Error):
     locale.setlocale(locale.LC_ALL, "en_US.UTF-8")
 
 NAME = "pyexcel"
-AUTHOR = "C.W."
-VERSION = "0.5.14"
+AUTHOR = "chfw"
+VERSION = "0.6.6"
 EMAIL = "info@pyexcel.org"
 LICENSE = "New BSD"
 DESCRIPTION = (
-    "A wrapper library that provides one API to read, manipulate and write"
-    + "data in different excel formats"
+    "A wrapper library that provides one API to read, manipulate and write" +
+    "data in different excel formats"
 )
 URL = "https://github.com/pyexcel/pyexcel"
-DOWNLOAD_URL = "%s/archive/0.5.14.tar.gz" % URL
-FILES = ["README.rst", "CHANGELOG.rst"]
-KEYWORDS = ["python", "tsv", "tsvz" "csv", "csvz", "xls", "xlsx", "ods"]
+DOWNLOAD_URL = "%s/archive/0.6.6.tar.gz" % URL
+FILES = ["README.rst", "CONTRIBUTORS.rst", "CHANGELOG.rst"]
+KEYWORDS = [
+    "python",
+    'tsv',
+    'tsvz'
+    'csv',
+    'csvz',
+    'xls',
+    'xlsx',
+    'ods'
+]
 
 CLASSIFIERS = [
     "Topic :: Software Development :: Libraries",
     "Programming Language :: Python",
     "Intended Audience :: Developers",
-    "Programming Language :: Python :: 2.6",
-    "Programming Language :: Python :: 2.7",
-    "Programming Language :: Python :: 3.3",
-    "Programming Language :: Python :: 3.4",
-    "Programming Language :: Python :: 3.5",
+
+    "Programming Language :: Python :: 3 :: Only",
+
+
+
     "Programming Language :: Python :: 3.6",
     "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
-    "Development Status :: 3 - Alpha",
-    "Programming Language :: Python :: Implementation :: PyPy",
+
+    'Development Status :: 3 - Alpha',
 ]
 
-INSTALL_REQUIRES = ["lml>=0.0.4", "pyexcel-io>=0.5.18"]
+PYTHON_REQUIRES = ">=3.6"
+
+INSTALL_REQUIRES = [
+    "lml>=0.0.4",
+    "pyexcel-io>=0.6.2",
+    "texttable>=0.8.2",
+]
 SETUP_COMMANDS = {}
 
-if PY2:
-    INSTALL_REQUIRES.append("texttable>=0.8.1")
-if not PY2:
-    INSTALL_REQUIRES.append("texttable>=0.8.2")
-if PY26:
-    INSTALL_REQUIRES.append("ordereddict")
-if PY26:
-    INSTALL_REQUIRES.append("weakrefset")
-if platform.python_implementation == "PyPy":
-    INSTALL_REQUIRES.append("lxml>=3.4.4")
-
-PACKAGES = find_packages(exclude=["ez_setup", "examples", "tests"])
+PACKAGES = find_packages(exclude=["ez_setup", "examples", "tests", "tests.*"])
 EXTRAS_REQUIRE = {
-    "xls": ["pyexcel-xls>=0.5.0"],
-    "xlsx": ["pyexcel-xlsx>=0.5.0"],
-    "ods": ["pyexcel-ods3>=0.5.0"],
+    "xls": ['pyexcel-xls>=0.6.0'],
+    "xlsx": ['pyexcel-xlsx>=0.6.0'],
+    "ods": ['pyexcel-ods3>=0.6.0'],
 }
 # You do not need to read beyond this line
-PUBLISH_COMMAND = "{0} setup.py sdist bdist_wheel upload -r pypi".format(
-    sys.executable
-)
-GS_COMMAND = (
-    "gs pyexcel v0.5.14 " + "Find 0.5.14 in changelog for more details"
-)
-NO_GS_MESSAGE = (
-    "Automatic github release is disabled. "
-    + "Please install gease to enable it."
-)
-UPLOAD_FAILED_MSG = (
-    'Upload failed. please run "%s" yourself.' % PUBLISH_COMMAND
-)
+PUBLISH_COMMAND = "{0} setup.py sdist bdist_wheel upload -r pypi".format(sys.executable)
 HERE = os.path.abspath(os.path.dirname(__file__))
 
+GS_COMMAND = ("gease pyexcel v0.6.6 " +
+              "Find 0.6.6 in changelog for more details")
+NO_GS_MESSAGE = ("Automatic github release is disabled. " +
+                 "Please install gease to enable it.")
+UPLOAD_FAILED_MSG = (
+    'Upload failed. please run "%s" yourself.' % PUBLISH_COMMAND)
+
 
 class PublishCommand(Command):
     """Support setup.py upload."""
@@ -129,13 +130,14 @@ class PublishCommand(Command):
             self.status(NO_GS_MESSAGE)
         if run_status:
             if os.system(PUBLISH_COMMAND) != 0:
-                self.status(UPLOAD_FAILED_MSG % PUBLISH_COMMAND)
+                self.status(UPLOAD_FAILED_MSG)
 
         sys.exit()
 
 
-SETUP_COMMANDS.update({"publish": PublishCommand})
-
+SETUP_COMMANDS.update({
+    "publish": PublishCommand
+})
 
 def has_gease():
     """
@@ -145,7 +147,6 @@ def has_gease():
     """
     try:
         import gease  # noqa
-
         return True
     except ImportError:
         return False
@@ -206,6 +207,7 @@ if __name__ == "__main__":
         long_description=read_files(*FILES),
         license=LICENSE,
         keywords=KEYWORDS,
+        python_requires=PYTHON_REQUIRES,
         extras_require=EXTRAS_REQUIRE,
         tests_require=["nose"],
         install_requires=INSTALL_REQUIRES,
@@ -213,5 +215,5 @@ if __name__ == "__main__":
         include_package_data=True,
         zip_safe=False,
         classifiers=CLASSIFIERS,
-        cmdclass=SETUP_COMMANDS,
+        cmdclass=SETUP_COMMANDS
     )
diff --git a/test.bat b/test.bat
index 35347ebb..5c37ea5f 100644
--- a/test.bat
+++ b/test.bat
@@ -1,2 +1,2 @@
 pip freeze
-nosetests --with-coverage --cover-package pyexcel --cover-package tests tests --with-doctest --doctest-extension=.rst README.rst docs/source pyexcel
+nosetests --with-coverage --cover-package pyexcel --cover-package tests tests --with-doctest --doctest-extension=.rst  docs/source pyexcel
diff --git a/test.sh b/test.sh
index a9a4f7c6..4a089d6f 100644
--- a/test.sh
+++ b/test.sh
@@ -1,3 +1,3 @@
 #/bin/bash
 pip freeze
-nosetests --with-coverage --cover-package pyexcel --cover-package tests tests --with-doctest --doctest-extension=.rst README.rst docs/source pyexcel
+nosetests --with-coverage --cover-package pyexcel --cover-package tests tests --with-doctest --doctest-extension=.rst  docs/source pyexcel
diff --git a/tests/base.py b/tests/base.py
index 69b1d06e..5ba6700c 100644
--- a/tests/base.py
+++ b/tests/base.py
@@ -3,6 +3,7 @@ import json
 
 import pyexcel as pe
 
+import unittest
 from nose.tools import eq_, raises
 
 
@@ -63,6 +64,16 @@ def create_sample_file2_in_memory(file_type):
     return io
 
 
+class PyexcelSheetBase(unittest.TestCase):
+    filename = "fixtures/non-uniform-rows.csv"
+
+    def setUp(self):
+        self.sheet = pe.Sheet([
+            [f"{row_no}_{col_no}" for col_no in range(10)]
+            for row_no in range(10)
+        ])
+
+
 class PyexcelBase:
     def _write_test_file(self, filename):
         """
diff --git a/tests/requirements.txt b/tests/requirements.txt
index da22512e..e1a25cfd 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -3,14 +3,16 @@ mock;python_version<"3"
 codecov
 coverage
 flake8
-SQLAlchemy
+black
+isort
+collective.checkdocs
+pygments
+moban
+moban_jinja2_github
 flask
-lxml==4.0.0;platform_python_implementation=="PyPy"
+SQLAlchemy
 pyexcel-xlsx>=0.4.1
 pyexcel-xls>=0.4.1
 pyexcel-text>=0.2.0
 psutil
-mock
-moban
-black;python_version>="3.6"
-isort;python_version>="3.6"
+pyexcel-pygal
diff --git a/tests/test_book.py b/tests/test_book.py
index c1a1d52f..c6446719 100644
--- a/tests/test_book.py
+++ b/tests/test_book.py
@@ -19,3 +19,12 @@ def test_book_len():
 
     book = p.Book(book_dict)
     eq_(len(book.test.array), 1)
+
+
+def test_sheet_ordering():
+    test_data = [["a", "b"]]
+
+    book_dict = {"first": test_data, "middle": test_data, "last": test_data}
+
+    book = p.Book(book_dict)
+    eq_(book.sheet_names(), ["first", "middle", "last"])
diff --git a/tests/test_bug_fixes.py b/tests/test_bug_fixes.py
index 1620e071..a1f7a8ba 100644
--- a/tests/test_bug_fixes.py
+++ b/tests/test_bug_fixes.py
@@ -5,10 +5,10 @@ import os
 from datetime import datetime
 from textwrap import dedent
 
+import psutil
 import pyexcel as p
 from _compact import StringIO, OrderedDict
 
-import psutil
 from nose.tools import eq_
 
 
diff --git a/tests/test_deprecation_notes.py b/tests/test_deprecation_notes.py
index ba21c6ba..e0119f16 100644
--- a/tests/test_deprecation_notes.py
+++ b/tests/test_deprecation_notes.py
@@ -1,4 +1,5 @@
 import warnings
+from unittest.mock import patch
 
 import pyexcel.ext.ods
 import pyexcel.ext.xls
@@ -6,8 +7,6 @@ import pyexcel.ext.ods3
 import pyexcel.ext.text
 import pyexcel.ext.xlsx
 
-from mock import patch
-
 try:
     reload
 except NameError:
diff --git a/tests/test_file_type_as_attribute.py b/tests/test_file_type_as_attribute.py
index 5140b599..38dcce06 100644
--- a/tests/test_file_type_as_attribute.py
+++ b/tests/test_file_type_as_attribute.py
@@ -1,8 +1,8 @@
 import os
 from textwrap import dedent
 
-import pyexcel.constants as constants
 from pyexcel import Book, Sheet, get_book
+from pyexcel import constants as constants
 from _compact import StringIO, OrderedDict
 from pyexcel.source import AbstractSource, MemorySourceMixin
 from pyexcel.plugins import SourceInfo
diff --git a/tests/test_formatters.py b/tests/test_formatters.py
index 5b1b322c..06f363e7 100644
--- a/tests/test_formatters.py
+++ b/tests/test_formatters.py
@@ -222,8 +222,7 @@ class TestRowFormatter(TestCase):
         save_as(dest_file_name=self.testfile, adict=self.data)
 
     def test_general_usage(self):
-        """format a row
-        """
+        """format a row"""
         r = get_sheet(file_name=self.testfile)
         r.row.format(1, str)
         c1 = r.row_at(1)
@@ -231,8 +230,7 @@ class TestRowFormatter(TestCase):
         self.assertEqual(c1, c2)
 
     def test_general_usage2(self):
-        """format a row
-        """
+        """format a row"""
         r = get_sheet(file_name=self.testfile)
         r.row.format(1, str)
         c1 = r.row_at(1)
@@ -240,8 +238,7 @@ class TestRowFormatter(TestCase):
         self.assertEqual(c1, c2)
 
     def test_one_formatter_for_two_rows(self):
-        """format more than one row
-        """
+        """format more than one row"""
         r = get_sheet(file_name=self.testfile)
         r.row.format([1, 2], str)
         c1 = r.row_at(2)
diff --git a/tests/test_gabagecollector.py b/tests/test_gabagecollector.py
index d7870d0e..53174fe0 100644
--- a/tests/test_gabagecollector.py
+++ b/tests/test_gabagecollector.py
@@ -1,7 +1,7 @@
 import os
 
-import pyexcel.internal.garbagecollector as gc
 from pyexcel import iget_array
+from pyexcel.internal import garbagecollector as gc
 
 from nose.tools import eq_
 
diff --git a/tests/test_http_source.py b/tests/test_http_source.py
index a4684492..68209f24 100644
--- a/tests/test_http_source.py
+++ b/tests/test_http_source.py
@@ -1,10 +1,9 @@
 from textwrap import dedent
 from unittest import TestCase
+from unittest.mock import MagicMock, patch
 
 import pyexcel as pe
-from pyexcel._compact import PY2, StringIO
-
-from mock import MagicMock, patch
+from pyexcel._compact import PY2, BytesIO, StringIO
 
 
 class TestHttpBookSource(TestCase):
@@ -12,7 +11,10 @@ class TestHttpBookSource(TestCase):
         self.patcher = patch("pyexcel._compact.request.urlopen")
         mock_open = self.patcher.start()
         self.mocked_info = MagicMock()
-        io = StringIO("1,2,3")
+        if PY2:
+            io = StringIO("1,2,3")
+        else:
+            io = BytesIO("1,2,3".encode("utf-8"))
         io.info = self.mocked_info
         mock_open.return_value = io
 
diff --git a/tests/test_internals.py b/tests/test_internals.py
index 18832380..1576895e 100644
--- a/tests/test_internals.py
+++ b/tests/test_internals.py
@@ -1,8 +1,8 @@
+from unittest.mock import MagicMock
+
 from pyexcel._compact import PY2
 from pyexcel.internal.core import _seek_at_zero
 
-from mock import MagicMock
-
 
 def test_seek_at_zero():
     stream = MagicMock()
diff --git a/tests/test_iterator.py b/tests/test_iterator.py
index a214ede8..960d9552 100644
--- a/tests/test_iterator.py
+++ b/tests/test_iterator.py
@@ -82,15 +82,13 @@ class TestMatrixColumn:
         m.extend_columns(1.1)
 
     def test_iadd_list(self):
-        """Test in place add a list
-        """
+        """Test in place add a list"""
         m2 = Matrix(self.data)
         m2.column += self.data3
         eq_(self.result, m2.get_internal_array())
 
     def test_add(self):
-        """Test operator add overload
-        """
+        """Test operator add overload"""
         # +
         m3 = Matrix(self.data)
         m4 = m3.column + self.data3
diff --git a/tests/test_multiple_sheets.py b/tests/test_multiple_sheets.py
index 5e6d1ead..1092f16b 100644
--- a/tests/test_multiple_sheets.py
+++ b/tests/test_multiple_sheets.py
@@ -4,7 +4,7 @@ import pyexcel as pe
 from base import PyexcelMultipleSheetBase, clean_up_files, create_sample_file1
 from _compact import OrderedDict
 
-from nose.tools import raises
+from nose.tools import eq_, raises
 
 
 class TestXlsNXlsmMultipleSheets(PyexcelMultipleSheetBase):
@@ -446,12 +446,8 @@ class TestAddBooks:
         """
         b1 = pe.BookReader(self.testfile)
         b3 = b1["Sheet1"] + b1["Sheet1"]
-        content = b3.dict
-        sheet_names = content.keys()
-        assert len(sheet_names) == 2
-        for name in sheet_names:
-            if "Sheet1" in name:
-                assert content[name] == self.content["Sheet1"]
+        b3["Sheet1"].row[0] = [3, 3, 3, 3]
+        eq_(b1["Sheet1"].row[0], [1, 1, 1, 1])
 
     @raises(TypeError)
     def test_add_book_error(self):
diff --git a/tests/test_sheet.py b/tests/test_sheet.py
new file mode 100644
index 00000000..cb8affa0
--- /dev/null
+++ b/tests/test_sheet.py
@@ -0,0 +1,71 @@
+from textwrap import dedent
+
+from pyexcel import Sheet
+
+from nose.tools import eq_
+
+
+def test_project():
+    sheet = Sheet(
+        [["A", "B", "C"], [1, 2, 3], [11, 22, 33], [111, 222, 333]],
+        name_columns_by_row=0,
+    )
+    expected = dedent(
+        """
+    pyexcel sheet:
+    +-----+-----+-----+
+    |  B  |  A  |  C  |
+    +=====+=====+=====+
+    | 2   | 1   | 3   |
+    +-----+-----+-----+
+    | 22  | 11  | 33  |
+    +-----+-----+-----+
+    | 222 | 111 | 333 |
+    +-----+-----+-----+"""
+    ).strip()
+    sheet = sheet.project(["B", "A", "C"])
+    eq_(expected, str(sheet))
+
+
+def test_project_for_less():
+    sheet = Sheet(
+        [["A", "B", "C"], [1, 2, 3], [11, 22, 33], [111, 222, 333]],
+        name_columns_by_row=0,
+    )
+    expected = dedent(
+        """
+    pyexcel sheet:
+    +-----+-----+
+    |  B  |  C  |
+    +=====+=====+
+    | 2   | 3   |
+    +-----+-----+
+    | 22  | 33  |
+    +-----+-----+
+    | 222 | 333 |
+    +-----+-----+"""
+    ).strip()
+    sheet = sheet.project(["B", "C"])
+    eq_(expected, str(sheet))
+
+
+def test_project_for_exclusion():
+    sheet = Sheet(
+        [["A", "B", "C"], [1, 2, 3], [11, 22, 33], [111, 222, 333]],
+        name_columns_by_row=0,
+    )
+    expected = dedent(
+        """
+    pyexcel sheet:
+    +-----+
+    |  A  |
+    +=====+
+    | 1   |
+    +-----+
+    | 11  |
+    +-----+
+    | 111 |
+    +-----+"""
+    ).strip()
+    sheet = sheet.project(["B", "C"], exclusion=True)
+    eq_(expected, str(sheet))
diff --git a/tests/test_sheet_access.py b/tests/test_sheet_access.py
new file mode 100644
index 00000000..e55dea6c
--- /dev/null
+++ b/tests/test_sheet_access.py
@@ -0,0 +1,47 @@
+import random
+
+from base import PyexcelSheetBase
+
+
+class TestSheetAccess(PyexcelSheetBase):
+    @staticmethod
+    def get_random_char():
+        i = random.randint(97, 122)
+        return chr(i)
+
+    def test_out_of_bounds_write(self):
+        value = self.get_random_char()
+        column = self.get_random_char() + self.get_random_char()
+        cell = column + str(random.randint(9, 30))
+        self.sheet[cell] = value
+
+        self.assertEqual(value, self.sheet[cell])
+
+    def test_out_of_column_bound_write(self):
+        value = self.get_random_char()
+        column = self.get_random_char() + self.get_random_char()
+        cell = 'A' + column + str(random.randint(9, 30))
+        self.sheet[cell] = value
+
+        self.assertEqual(value, self.sheet[cell])
+
+    def test_out_of_bounds_read(self):
+        with self.assertRaises(IndexError):
+            self.sheet[0, 20]
+
+        with self.assertRaises(IndexError):
+            self.sheet[20, 0]
+
+    def test_column_edge_case(self):
+        column = self.sheet.number_of_columns()-1
+
+        self.assertEqual(self.sheet[0, column], f"0_{column}")
+        with self.assertRaises(IndexError):
+            self.sheet[0, column+1]
+
+    def test_row_edge_case(self):
+        row = self.sheet.number_of_rows()-1
+
+        self.assertEqual(self.sheet[row, 0], f"{row}_0")
+        with self.assertRaises(IndexError):
+            self.sheet[row+1, 0]
diff --git a/tests/test_sheet_attributes.py b/tests/test_sheet_attributes.py
index 295f6a54..961278ac 100644
--- a/tests/test_sheet_attributes.py
+++ b/tests/test_sheet_attributes.py
@@ -2,7 +2,7 @@
 import copy
 from textwrap import dedent
 
-from pyexcel.sheet import Sheet
+from pyexcel.sheet import Sheet, make_names_unique
 from pyexcel.internal.meta import PyexcelObject
 
 from nose.tools import eq_, raises
@@ -130,3 +130,31 @@ def test_svg_representation():
 def test_pyexcel_object():
     obj = PyexcelObject()
     obj.save_to_memory("csv")
+
+
+def test_make_names_unique():
+    alist = ["a", "a"]
+    new_names = make_names_unique(alist)
+    expected = ["a", "a-1"]
+    eq_(new_names, expected)
+
+
+def test_make_names_unique_includes_leading_whitespace():
+    alist = ["a", " a"]
+    new_names = make_names_unique(alist)
+    expected = ["a", "a-1"]
+    eq_(new_names, expected)
+
+
+def test_make_names_unique_includes_trailing_whitespace():
+    alist = ["a", "a "]
+    new_names = make_names_unique(alist)
+    expected = ["a", "a-1"]
+    eq_(new_names, expected)
+
+
+def test_make_names_unique_includes_whitespace():
+    alist = ["a", "   a   ", "   ", "   "]
+    new_names = make_names_unique(alist)
+    expected = ["a", "a-1", "", "-1"]
+    eq_(new_names, expected)
diff --git a/tests/test_sheet_column.py b/tests/test_sheet_column.py
index 7d9fcd9d..a78bf191 100644
--- a/tests/test_sheet_column.py
+++ b/tests/test_sheet_column.py
@@ -1,7 +1,7 @@
 from pyexcel import Sheet
 from _compact import OrderedDict
 
-from nose.tools import eq_, raises
+from nose.tools import eq_, raises, assert_not_in
 
 
 class TestSheetColumn:
@@ -33,11 +33,20 @@ class TestSheetColumn:
         eq_(s.column["Column 1"], ["1", "4", "7"])
         eq_(s.column["Column 3"], ["3", "6", "9"])
 
+    @raises(AttributeError)
     def test_add(self):
         s = Sheet(self.data, "test")
         s.name_columns_by_row(0)
         data = OrderedDict({"Column 4": [10, 11, 12]})
-        s = s.column + data
+        s1 = s.column + data
+        eq_(s1.column.Column_4, [10, 11, 12])
+        eq_(s.column.Column_4, [10, 11, 12])
+
+    def test_iadd(self):
+        s = Sheet(self.data, "test")
+        s.name_columns_by_row(0)
+        data = OrderedDict({"Column 4": [10, 11, 12]})
+        s.column += data
         eq_(s.column.Column_4, [10, 11, 12])
 
     @raises(TypeError)
@@ -132,7 +141,15 @@ class TestSheetColumn2:
         s = Sheet(self.data, "test")
         s.name_columns_by_row(2)
         data = OrderedDict({"Column 4": [10, 11, 12]})
-        s = s.column + data
+        s1 = s.column + data
+        eq_(s1.column["Column 4"], [10, 11, 12])
+        assert_not_in("Column 4", s.column)
+
+    def test_iadd(self):
+        s = Sheet(self.data, "test")
+        s.name_columns_by_row(2)
+        data = OrderedDict({"Column 4": [10, 11, 12]})
+        s.column += data
         assert s.column["Column 4"] == [10, 11, 12]
 
     def test_dot_notation(self):
diff --git a/tests/test_sheet_row.py b/tests/test_sheet_row.py
index 567c19a3..d17ad63b 100644
--- a/tests/test_sheet_row.py
+++ b/tests/test_sheet_row.py
@@ -1,7 +1,7 @@
 from pyexcel import Sheet
 from _compact import OrderedDict
 
-from nose.tools import eq_, raises
+from nose.tools import eq_, raises, assert_not_in
 
 
 class TestSheetRow:
@@ -72,7 +72,15 @@ class TestSheetRow:
         s = Sheet(self.data, "test")
         s.name_rows_by_column(0)
         data = OrderedDict({"Row 5": [10, 11, 12]})
-        s = s.row + data
+        s1 = s.row + data
+        assert s1.row["Row 5"] == [10, 11, 12]
+        assert_not_in("Row 5", s.row)
+
+    def test_iadd(self):
+        s = Sheet(self.data, "test")
+        s.name_rows_by_column(0)
+        data = OrderedDict({"Row 5": [10, 11, 12]})
+        s.row += data
         assert s.row["Row 5"] == [10, 11, 12]
 
     def test_dot_notation(self):
diff --git a/tests/test_sheet_stream.py b/tests/test_sheet_stream.py
index 936d8d7b..88076f46 100644
--- a/tests/test_sheet_stream.py
+++ b/tests/test_sheet_stream.py
@@ -4,8 +4,8 @@ from pyexcel.internal.common import get_sheet_headers
 from pyexcel.internal.generators import SheetStream
 from pyexcel.plugins.sources.output_to_memory import WriteSheetToMemory
 
-import pyexcel_io.manager as manager
 from nose.tools import eq_
+from pyexcel_io import manager as manager
 
 
 def test_save_to():
diff --git a/tests/test_sheets.py b/tests/test_sheets.py
index 26ac76a8..8335df98 100644
--- a/tests/test_sheets.py
+++ b/tests/test_sheets.py
@@ -1,7 +1,6 @@
 import copy
 
 from pyexcel import Sheet, load_from_dict, load_from_records
-from _compact import OrderedDict
 
 from nose.tools import eq_, raises
 
@@ -126,282 +125,6 @@ class TestFormatter:
         s.paste((1, 2))
 
 
-class TestSheetColumn:
-    def setUp(self):
-        self.data = [
-            ["Column 1", "Column 2", "Column 3"],
-            [1, 2, 3],
-            [4, 5, 6],
-            [7, 8, 9],
-        ]
-
-    def test_formatter_by_named_column(self):
-        """Test one named column"""
-        s = Sheet(self.data, "test")
-        s.name_columns_by_row(0)
-        s.column.format("Column 1", str)
-        assert s.column["Column 1"] == ["1", "4", "7"]
-
-    def test_formatter_by_named_columns(self):
-        """Test multiple named columns"""
-        s = Sheet(self.data, "test")
-        s.name_columns_by_row(0)
-        s.column.format(["Column 1", "Column 3"], str)
-        assert s.column["Column 1"] == ["1", "4", "7"]
-        assert s.column["Column 3"] == ["3", "6", "9"]
-
-    def test_add(self):
-        s = Sheet(self.data, "test")
-        s.name_columns_by_row(0)
-        data = OrderedDict({"Column 4": [10, 11, 12]})
-        s = s.column + data
-        assert s.column["Column 4"] == [10, 11, 12]
-
-    @raises(TypeError)
-    def test_add_wrong_type(self):
-        """Add string type"""
-        s = Sheet(self.data, "test")
-        s.name_columns_by_row(0)
-        s = s.column + "string type"  # bang
-
-    @raises(ValueError)
-    def test_delete_named_column(self):
-        s = Sheet(self.data, "test")
-        s.name_columns_by_row(0)
-        del s.column["Column 2"]
-        assert s.number_of_columns() == 2
-        s.column["Column 2"]  # bang
-
-    @raises(ValueError)
-    def test_delete_indexed_column1(self):
-        s = Sheet(self.data, "test")
-        s.name_columns_by_row(0)
-        del s.column[1]
-        assert s.number_of_columns() == 2
-        s.column["Column 2"]  # access it after deletion, bang
-
-    @raises(ValueError)
-    def test_delete_indexed_column2(self):
-        s = Sheet(self.data, "test")
-        s.name_columns_by_row(0)
-        del s.column["Column 2"]
-        assert s.number_of_columns() == 2
-        s.column["Column 2"]  # access it after deletion, bang
-
-    @raises(ValueError)
-    def test_delete_indexed_column(self):
-        s = Sheet(self.data, "test")
-        s.name_columns_by_row(0)
-        s.delete_named_column_at(1)
-        assert s.number_of_columns() == 2
-        s.column["Column 2"]  # access it after deletion, bang
-
-    @raises(ValueError)
-    def test_delete_column(self):
-        s = Sheet(self.data, "test")
-        del s.column[1, 2]
-        assert s.number_of_columns() == 1
-        s.column["Column 2"]  # access it after deletion, bang
-
-
-class TestSheetColumn2:
-    def setUp(self):
-        self.data = [
-            [1, 2, 3],
-            [4, 5, 6],
-            ["Column 1", "Column 2", "Column 3"],
-            [7, 8, 9],
-        ]
-
-    def test_series(self):
-        s = Sheet(self.data, "test")
-        s.name_columns_by_row(2)
-        assert s.colnames == ["Column 1", "Column 2", "Column 3"]
-        custom_columns = ["C1", "C2", "C3"]
-        s.colnames = custom_columns
-        assert s.colnames == custom_columns
-
-    def test_series2(self):
-        custom_columns = ["C1", "C2", "C3"]
-        s = Sheet(self.data, "test", colnames=custom_columns)
-        assert s.colnames == custom_columns
-
-    @raises(NotImplementedError)
-    def test_series3(self):
-        custom_columns = ["C1", "C2", "C3"]
-        Sheet(
-            self.data, "test", colnames=custom_columns, name_columns_by_row=0
-        )
-
-    def test_formatter_by_named_column(self):
-        s = Sheet(self.data, "test")
-        s.name_columns_by_row(2)
-        s.column.format("Column 1", str)
-        assert s.column["Column 1"] == ["1", "4", "7"]
-
-    def test_formatter_by_named_column_2(self):
-        s = Sheet(self.data, "test")
-        s.name_columns_by_row(2)
-        s.column.format("Column 1", str)
-        assert s.column["Column 1"] == ["1", "4", "7"]
-
-    def test_add(self):
-        s = Sheet(self.data, "test")
-        s.name_columns_by_row(2)
-        data = OrderedDict({"Column 4": [10, 11, 12]})
-        s = s.column + data
-        assert s.column["Column 4"] == [10, 11, 12]
-
-    @raises(ValueError)
-    def test_delete_named_column(self):
-        s = Sheet(self.data, "test")
-        s.name_columns_by_row(2)
-        del s.column["Column 2"]
-        assert s.number_of_columns() == 2
-        s.column["Column 2"]  # bang
-
-    def test_set_indexed_row(self):
-        s = Sheet(self.data, "test")
-        s.name_columns_by_row(2)
-        s.row[0] = [10000, 1, 11]
-        assert s.row[0] == [10000, 1, 11]
-
-
-class TestSheetRow:
-    def setUp(self):
-        self.data = [
-            ["Row 0", -1, -2, -3],
-            ["Row 1", 1, 2, 3],
-            ["Row 2", 4, 5, 6],
-            ["Row 3", 7, 8, 9],
-        ]
-
-    def test_formatter_by_named_row(self):
-        s = Sheet(self.data, "test")
-        s.name_rows_by_column(0)
-        s.row.format("Row 1", str)
-        assert s.row["Row 1"] == ["1", "2", "3"]
-
-    def test_rownames(self):
-        s = Sheet(self.data, "test", name_rows_by_column=0)
-        assert s.rownames == ["Row 0", "Row 1", "Row 2", "Row 3"]
-        custom_rows = ["R0", "R1", "R2", "R3"]
-        s.rownames = custom_rows
-        assert s.rownames == custom_rows
-
-    def test_rownames2(self):
-        custom_rows = ["R0", "R1", "R2", "R3"]
-        s = Sheet(self.data, "test", rownames=custom_rows)
-        assert s.rownames == custom_rows
-
-    @raises(NotImplementedError)
-    def test_rownames3(self):
-        custom_rows = ["R0", "R1", "R2", "R3"]
-        Sheet(self.data, "test", name_rows_by_column=0, rownames=custom_rows)
-
-    def test_formatter_by_named_row_2(self):
-        s = Sheet(self.data, "test")
-        s.name_rows_by_column(0)
-        s.row.format("Row 1", str)
-        assert s.row["Row 1"] == ["1", "2", "3"]
-
-    def test_row_series_to_dict(self):
-        s = Sheet(self.data, "test")
-        s.name_rows_by_column(0)
-        content = s.to_dict(True)
-        keys = ["Row 0", "Row 1", "Row 2", "Row 3"]
-        assert keys == list(content.keys())
-
-    @raises(TypeError)
-    def test_extend_rows_using_wrong_data_type(self):
-        s = Sheet(self.data, "test")
-        s.name_rows_by_column(0)
-        s.extend_rows([1, 2])
-
-    def test_formatter_by_named_row2(self):
-        """Test a list of string as index"""
-        s = Sheet(self.data, "test")
-        s.name_rows_by_column(0)
-        s.row.format(["Row 1", "Row 2"], str)
-        assert s.row["Row 1"] == ["1", "2", "3"]
-        assert s.row["Row 2"] == ["4", "5", "6"]
-
-    def test_add(self):
-        s = Sheet(self.data, "test")
-        s.name_rows_by_column(0)
-        data = OrderedDict({"Row 5": [10, 11, 12]})
-        s = s.row + data
-        assert s.row["Row 5"] == [10, 11, 12]
-
-    @raises(TypeError)
-    def test_add_wrong_type(self):
-        s = Sheet(self.data, "test")
-        s.name_rows_by_column(0)
-        s = s.row + "string type"  # bang
-
-    @raises(ValueError)
-    def test_delete_named_row(self):
-        s = Sheet(self.data, "test")
-        s.name_rows_by_column(0)
-        del s.row["Row 2"]
-        assert s.number_of_rows() == 3
-        s.row["Row 2"]  # already deleted
-
-    @raises(ValueError)
-    def test_delete_indexed_row1(self):
-        s = Sheet(self.data, "test")
-        s.name_rows_by_column(0)
-        del s.row[2]
-        assert s.number_of_rows() == 3
-        s.row["Row 2"]  # already deleted
-
-    @raises(ValueError)
-    def test_delete_indexed_row2(self):
-        s = Sheet(self.data, "test")
-        s.name_rows_by_column(0)
-        s.delete_named_row_at(2)
-        assert s.number_of_rows() == 3
-        s.row["Row 2"]  # already deleted
-
-    @raises(ValueError)
-    def test_delete_indexed_row3(self):
-        s = Sheet(self.data, "test")
-        s.name_rows_by_column(0)
-        del s.row["Row 0", "Row 1"]
-        assert s.number_of_rows() == 2
-        s.row["Row 1"]  # already deleted
-
-    @raises(ValueError)
-    def test_delete_row(self):
-        s = Sheet(self.data, "test")
-        del s.row[1, 2]
-        assert s.number_of_rows() == 2
-        s.row["Row 1"]  # already deleted
-
-    def test_column_locator2(self):
-        """
-        Remove odd columns
-        """
-        sheet = Sheet(self.data)
-
-        def locator(index, _):
-            return index % 2 == 0
-
-        del sheet.row[locator]
-        assert sheet.number_of_rows() == 2
-
-    def test_set_named_row(self):
-        s = Sheet(self.data, "test")
-        s.name_rows_by_column(0)
-        s.row["Row 2"] = [11, 11, 11]
-        assert s.row["Row 2"] == [11, 11, 11]
-
-    def test_set_indexed_column(self):
-        s = Sheet(self.data, "test", name_rows_by_column=0)
-        s.column[0] = [12, 3, 4, 5]
-        assert s.column[0] == [12, 3, 4, 5]
-
-
 class TestUniquenessOfNames:
     def test_column_names(self):
         data = [
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 72f48be4..141afca9 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -53,8 +53,7 @@ class TestToRecord(TestCase):
         eq_(result, list(actual))
 
     def test_book_reader_to_records_custom(self):
-        """use custom header
-        """
+        """use custom header"""
         r = pe.SeriesReader(self.testfile)
         custom_headers = ["O", "P", "Q"]
         result = [