sphinxcontrib-inheritance is a Sphinx extension that provides Tryton-specific markup.
This extension can be installed from the Python Package Index:
pip install sphinxcontrib-inheritance
Alternatively, you can clone the inheritance repository from BitBucket, and install the extension directly from the repository:
hg clone https://bitbucket.org/albertnan/sphinxcontrib-inheritance
python setup.py install
Please refer to the documentation for further information.