Python docstring style checker
https://github.com/PyCQA/pydocstyle/

pydocstyle is a static analysis tool for checking compliance with
Python docstring conventions.

pydocstyle supports most of PEP 257 out of the box, but it should not
be considered a reference implementation.

The framework for checking docstring style is flexible, and custom
checks can be easily added, for example to cover NumPy docstring
conventions.