[mixmastamyk]

Try pyflakes, it will find a majority of those.

[notpushkin]

Wemake [1] is much more comprehensive, although you might find it overwhelming at first. It includes a lot of useful flake8 rules that tackle complexity, enforce consistency and best practices and much much more.

[1]: https://wemake-python-styleguide.readthedocs.io/en/latest/

[mixmastamyk]

Styling is not the problem the poster was complaining about, and why I specifically chose pyflakes out of dozens of such tools.