2015-12-12 Python code to generate part of sphinx documentation

I used the same title as a question asked on stackoverflow: Python code to generate part of sphinx documentation, is it possible?. It became the following RunPythonDirective which does the same with more options:

.. runpython:
    :showcode:
    :rst:

    from pyquickhelper import df2rst
    import pandas
    df = <some dataframe>
    print(df2rst(df))

Because of the option rst, what is printed out becomes part of the documentation through function nested_parse_with_titles. In sphinx configuration setup, the following lines must be added:

from pyquickhelper.helpgen.sphinx_runpython_extension import RunPythonDirective
from pyquickhelper.helpgen.sphinx_runpython_extension import runpython_node, visit_runpython_node, depart_runpython_node

def setup(app):
    app.add_node(runpython_node,
                 html=(visit_runpython_node, depart_runpython_node),
                 latex=(visit_runpython_node, depart_runpython_node),
                 text=(visit_runpython_node, depart_runpython_node))
    app.add_directive('runpython', RunPythonDirective)