You want to add some code to cssselect2, launch its tests or improve its documentation? Thank you very much! Here are some tips to help you play with cssselect2 in good conditions.

The first step is to clone the repository, create a virtual environment and install cssselect2 dependencies.

git clone
cd cssselect2
python -m venv venv
venv/bin/pip install .[doc,test]

You can then let your terminal in the current directory and launch Python to test your changes. import cssselect2 will then import the working directory code, so that you can modify it and test your changes.


Code & Issues

If you’ve found a bug in cssselect2, it’s time to report it, and to fix it if you can!

You can report bugs and feature requests on GitHub. If you want to add or fix some code, please fork the repository and create a pull request, we’ll be happy to review your work.


Tests are stored in the tests folder at the top of the repository. They use the pytest library.

You can launch tests using the following command:

venv/bin/python -m pytest

cssselect2 also uses isort to check imports and flake8 to check the coding style:

venv/bin/python -m isort . --check --diff
venv/bin/python -m flake8 --exclude tests/css-parsing-tests


Documentation is stored in the docs folder at the top of the repository. It relies on the Sphinx library.

You can build the documentation using the following command:

venv/bin/sphinx-build docs docs/_build

The documentation home page can now be found in the docs/_build/index.html file. You can open this file in a browser to see the final rendering.