Flake8 is a wrapper around these tools:

PyFlakes
pycodestyle
Ned Batchelder’s McCabe script
Flake8 runs all the tools by launching the single flake8 command. It displays the warnings in a per-file, merged output.

It also adds a few features:

files that contain this line are skipped:

# flake8: noqa
lines that contain a # noqa comment at the end will not issue warnings.

you can ignore specific errors on a line with # noqa: error, e.g., # noqa: E234. Multiple codes can be given, separated by comma. The noqa token is case insensitive, the colon before the list of codes is required otherwise the part after noqa is ignored

Git and Mercurial hooks

extendable through flake8.extension and flake8.formatting entry points