gh-110558: Run ruff on Argument Clinic in CI

[AlexWaygood]

• Issue: Run ruff on Argument Clinic in CI #110558

[AlexWaygood]

https://github.com/python/cpython/actions/runs/6456495002/job/17526096001?pr=110559 shows what it looks like when the job fails

[AlexWaygood]

A few questions:

1. Should we also run all pyflakes checks on Lib/test/test_clinic.py? I'd quite like to; we also had things like unused variables etc. in the test file in the past. If so, maybe we should remove that file from the existing ruff check? (But having it manually excluded from the existing ruff check would add complexity, and ruff is incredibly fast, so maybe it's okay to run ruff twice in CI on that one file.)
2. Do we want to add ruff to Tools/requirements-dev.txt? It might be helpful for running ruff locally -- you could just run pip install -r Tools/requirements-dev.txt in a venv to install all the linting tools for Argument Clinic. On the other hand, we're running ruff via pre-commit in CI, and it's really easy to do that locally as well, so maybe it's not necessary to add it to Tools/requirements-dev.txt.
3. Any other rules we want to add right off the bat? (We can always add more in follow-up PRs.)

[AlexWaygood]

1. Should we also run all pyflakes checks on Lib/test/test_clinic.py? I'd quite like to; we also had things like unused variables etc. in the test file in the past. If so, maybe we should remove that file from the existing ruff check? (But having it manually excluded from the existing ruff check would add complexity, and ruff is incredibly fast, so maybe it's okay to run ruff twice in CI on that one file.)

On the one hand, a nicer way of solving this might be to work on slowly adding more enabled error codes to https://github.com/python/cpython/blob/main/Lib/test/.ruff.toml. On the other hand, there are currently 3095 errors reported by ruff if you enable all the pyflakes rules and run it on Lib/test/, whereas there are 0 errors reported by ruff if you do the same thing, but run it only on Lib/test/test_clinic.py. So it would probably be quite a while before we'd be able to enable all the pyflakes checks on all of Lib/test/...

[erlend-aasland]

2. Do we want to add ruff to Tools/requirements-dev.txt? It might be helpful for running ruff locally -- you could just run pip install -r Tools/requirements-dev.txt in a venv to install all the linting tools for Argument Clinic. On the other hand, we're running ruff via pre-commit in CI, and it's really easy to do that locally as well, so maybe it's not necessary to add it to Tools/requirements-dev.txt.

Running ruff via pre-commit sounds good to me; having more such stuff in pre-commit is convenient and useful.

[AlexWaygood]

I'm going to try backporting this, but if ruff fails for any reason on the older branches, I'm not going to try too hard to fix it (I'll just close the PRs).

[miss-islington]

Thanks @AlexWaygood for the PR 🌮🎉.. I'm working now to backport this PR to: 3.11, 3.12.
🐍🍒⛏🤖

[miss-islington]

Sorry, @AlexWaygood, I could not cleanly backport this to 3.12 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 7b2764e798e400b8f5fcc199739405e6fbd05c20 3.12 

[miss-islington]

Sorry, @AlexWaygood, I could not cleanly backport this to 3.11 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 7b2764e798e400b8f5fcc199739405e6fbd05c20 3.11 

[bedevere-app]

GH-110598 is a backport of this pull request to the 3.12 branch.

[AlexWaygood]

I created a backport PR to 3.12, but there's a ton of ruff failures on 3.11, so I won't bother with that one.