I'm using black and isort for other projects (see e.g. https://github.com/hyperopt/hyperopt/pull/748/files) and find them quite useful to have more consistent codebase. I think you should drop python3.5 support though, as black is python3.6+. Is this something you would be open to consider?

Documentation problem

The current documentation demonstrates pandera usage by using the pa.PandasDtype enum, which can make things look a little unfamiliar to new-comers, especially since it now supports the use of python types and numpy scalar types, for example, see:

• documentation example: https://pandera.readthedocs.io/en/stable/#quick-start
• docstrings example: https://githu