Comment 2 for bug 1418658

So PyFlakes is a linter, not a style checker. It checks for unused variables, imports, etc. It doesn't apply style consistency. pep8 and pep257 are two tools that apply style checks for style consistency.

Flake8 is a tool that provides linting and style checks (by utilizing pyfakes and pep8) and has an extension called "flake8-docstrings" which utilizes pep257 to provide the checks by running one tool.

pyflakes has no extension capability, and as far as I'm aware has no plans to add one since you have that feature through flake8.