Is there a reason why in travis CI config the command black --check . || true is run? I don't see the point in checking if files needs to be reformatted if it's just going to be ignored anyways.

Currently running black --line-length 127 --check . -> 399 files would be reformatted, 74 files would be left unchanged.

In addition running flake8 . --count --show-source --statistics --max-line-length=127 Yields 2496 errors which is reduced to 746 after reformatting using black --line-length 127 .

As a side note it might be a good idea to run pytest/doctest/unittest here too to make sure tests are passing.