The entire codebase now passes a mandatory jenkins job (pre-code-review) , which requires valid docstrings except for functions and methods.
Thanks to everyone involved in bringing the documentation up to this standard.
There is still lots to do, like adding docstrings for functions and methods; full list of missing docstrings at:
https://integration.wikimedia.org/ci/job/pywikibot-core-tox-flake8-docstring...
-- John Vandenberg