Lint code

[pierrepo]

I advise you to use pycodestyle, pydocstyle and pylint (and maybe pyflakes).

Doc:

• https://python.sdv.univ-paris-diderot.fr/15_bonnes_pratiques/#153-outils-de-controle-qualite-du-code
• https://realpython.com/python-code-quality/#how-to-improve-python-code-quality