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?

Is your feature request related to a problem? Please describe.

Since dropping python 3.5 #142 the pandera code-base can now use f-string formatting for conciseness and ✨ elegance ✨

Describe the solution you'd like

• replace all instances of '%s' formatting with f"{}" string formatting