how to only use pyflakes checks with pep8 (never style checks)?

Question

I'm migrating from pyflakes to flake8 to get the # noqa line ignore feature. To ease the migration, I'd like to start with only checking whatever pyflakes was previously checking, and I like pyflakes simple promise to "will never complain about style". Can I just use flake8 --select F to start with whatever was reported by pyflakes?

flake8 allows selecting or disabling specific error codes like F401 "module imported but unused". What does F stand for?

The flake8 error-code documentation doesn't list all error codes.

Answer 1

Yes, to only use pyflakes:

flake8 --select F

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flake8 documents the F and C "classes" on the pyflakes glossary:

• F: pyflakes lint checks; some documented by flake8
• C: mccabe complexity, currently only C901
• W and E: pep8 violations documented by pycodestyle
  • E999 is not a pep error; "We report E999 when we fail to compile a file into an Abstract Syntax Tree for the plugins that require it"