Consider using wemake-python-styleguide

[sobolevn]

wemake-python-styleguide is the strictest python linter out there.

I see that you already use flake8 and pylint.
That's great! Because wemake-python-styleguide combines these two together.
flake8 is great due to its simplicity and plugin system. And wemake-python-styleguide is just a flake8 plugin on steroids. It just works as a regular plugin. On the other hand, we have more rules than pylint (and mostly compatible with it), so it can be easily replaced. This can save you from the configuration hell in setup.cfg you currently have.

That's how output looks like:

We also have a nice Github Action with pre-installed reviewdog that can format errors in a nice human-readable manner like so:

Repo: https://github.com/wemake-services/wemake-python-styleguide
Github Action: https://github.com/marketplace/actions/wemake-python-styleguide
Related to #3, because we already have isort installed.

If it is interesting, I can help with the migration process.