Graphviz
========

|PyPI version| |License| |Supported Python| |Wheel| |Downloads|

|Build| |Codecov| |Readthedocs-stable| |Readthedocs-latest|

|Binder-stable|

This package facilitates the creation and rendering of graph descriptions in
the DOT_ language of the Graphviz_ graph drawing software (`upstream repo`_)
from Python.

Create a graph object, assemble the graph by adding nodes and edges, and
retrieve its DOT source code string. Save the source code to a file and render
it with the Graphviz installation of your system.

Use the ``view`` option/method to directly inspect the resulting (PDF, PNG,
SVG, etc.) file with its default application. Graphs can also be rendered
and displayed within `Jupyter notebooks`_ (formerly known as
`IPython notebooks`_,
`example <notebook_>`_, `nbviewer <notebook-nbviewer_>`_)
as well as the `Jupyter QtConsole`_.


Links
-----

- GitHub: https://github.com/xflr6/graphviz
- PyPI: https://pypi.org/project/graphviz/
- Documentation: https://graphviz.readthedocs.io
- Changelog: https://graphviz.readthedocs.io/en/latest/changelog.html
- Issue Tracker: https://github.com/xflr6/graphviz/issues
- Download: https://pypi.org/project/graphviz/#files


Installation
------------

This package runs under Python 3.7+, use pip_ to install:

.. code:: bash

    $ pip install graphviz

To render the generated DOT source code, you also need to install Graphviz_
(`download page <upstream-download_>`_,
`archived versions <upstream-archived_>`_,
`installation procedure for Windows <upstream-windows_>`_).

Make sure that the directory containing the ``dot`` executable is on your
systems' ``PATH``
(sometimes done by the installer;
setting ``PATH``
on `Linux <set-path-linux_>`_,
`Mac <set-path-darwin_>`_,
and `Windows <set-path-windows_>`_).

Anaconda_: see the conda-forge_ package
`conda-forge/python-graphviz <conda-forge-python-graphviz_>`_
(`feedstock <conda-forge-python-graphviz-feedstock_>`_),
which should automatically ``conda install``
`conda-forge/graphviz <conda-forge-graphviz_>`_
(`feedstock <conda-forge-graphviz-feedstock_>`_) as dependency.


Quickstart
----------

Create a graph object:

.. code:: python

    >>> import graphviz  # doctest: +NO_EXE
    >>> dot = graphviz.Digraph(comment='The Round Table')
    >>> dot  #doctest: +ELLIPSIS
    <graphviz.graphs.Digraph object at 0x...>

Add nodes and edges:

.. code:: python

    >>> dot.node('A', 'King Arthur')  # doctest: +NO_EXE
    >>> dot.node('B', 'Sir Bedevere the Wise')
    >>> dot.node('L', 'Sir Lancelot the Brave')

    >>> dot.edges(['AB', 'AL'])
    >>> dot.edge('B', 'L', constraint='false')

Check the generated source code:

.. code:: python

    >>> print(dot.source)  # doctest: +NORMALIZE_WHITESPACE +NO_EXE
    // The Round Table
    digraph {
        A [label="King Arthur"]
        B [label="Sir Bedevere the Wise"]
        L [label="Sir Lancelot the Brave"]
        A -> B
        A -> L
        B -> L [constraint=false]
    }

Save and render the source code:

.. code:: python

    >>> doctest_mark_exe()

    >>> dot.render('doctest-output/round-table.gv').replace('\\', '/')
    'doctest-output/round-table.gv.pdf'

Save and render and view the result:

.. code:: python

    >>> doctest_mark_exe()

    >>> dot.render('doctest-output/round-table.gv', view=True)  # doctest: +SKIP
    'doctest-output/round-table.gv.pdf'

.. image:: https://raw.github.com/xflr6/graphviz/master/docs/_static/round-table.svg
    :align: center
    :alt: round-table.svg

**Caveat:**
Backslash-escapes and strings of the form ``<...>``
have a special meaning in the DOT language.
If you need to render arbitrary strings (e.g. from user input),
check the details in the `user guide`_.


See also
--------

- pygraphviz_ |--| full-blown interface wrapping the Graphviz C library with SWIG
- graphviz-python_ |--| official Python bindings
  (`documentation <graphviz-python-docs_>`_)
- pydot_ |--| stable pure-Python approach, requires pyparsing


License
-------

This package is distributed under the `MIT license`_.


Development
-----------

- Development documentation: https://graphviz.readthedocs.io/en/latest/development.html
- Release process: https://graphviz.readthedocs.io/en/latest/release_process.html


.. _Graphviz:  https://www.graphviz.org
.. _DOT: https://www.graphviz.org/doc/info/lang.html
.. _upstream repo: https://gitlab.com/graphviz/graphviz/
.. _upstream-download: https://www.graphviz.org/download/
.. _upstream-archived: https://www2.graphviz.org/Archive/stable/
.. _upstream-windows: https://forum.graphviz.org/t/new-simplified-installation-procedure-on-windows/224

.. _set-path-windows: https://www.computerhope.com/issues/ch000549.htm
.. _set-path-linux: https://stackoverflow.com/questions/14637979/how-to-permanently-set-path-on-linux-unix
.. _set-path-darwin: https://stackoverflow.com/questions/22465332/setting-path-environment-variable-in-osx-permanently

.. _pip: https://pip.pypa.io

.. _Jupyter notebooks: https://jupyter.org
.. _IPython notebooks: https://ipython.org/notebook.html
.. _Jupyter QtConsole: https://qtconsole.readthedocs.io

.. _notebook: https://github.com/xflr6/graphviz/blob/master/examples/graphviz-notebook.ipynb
.. _notebook-nbviewer: https://nbviewer.org/github/xflr6/graphviz/blob/master/examples/graphviz-notebook.ipynb

.. _Anaconda: https://docs.anaconda.com/anaconda/install/
.. _conda-forge: https://conda-forge.org
.. _conda-forge-python-graphviz: https://anaconda.org/conda-forge/python-graphviz
.. _conda-forge-python-graphviz-feedstock: https://github.com/conda-forge/python-graphviz-feedstock
.. _conda-forge-graphviz: https://anaconda.org/conda-forge/graphviz
.. _conda-forge-graphviz-feedstock: https://github.com/conda-forge/graphviz-feedstock

.. _user guide: https://graphviz.readthedocs.io/en/stable/manual.html

.. _pygraphviz: https://pypi.org/project/pygraphviz/
.. _graphviz-python: https://pypi.org/project/graphviz-python/
.. _graphviz-python-docs: https://www.graphviz.org/pdf/gv.3python.pdf
.. _pydot: https://pypi.org/project/pydot/

.. _MIT license: https://opensource.org/licenses/MIT


.. |--| unicode:: U+2013


.. |PyPI version| image:: https://img.shields.io/pypi/v/graphviz.svg
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