F821 false positive when using ExceptionGroup

[iurii-skorniakov]

version: ruff 0.6.4, Python 3.11.6
command: ruff check --isolated example.py

when using built-in ExceptionGroup

class MyGroup(ExceptionGroup):
    def derive(self, excs):
        return MyGroup(self.message, excs)

ruff raises F821

example.py:1:15: F821 Undefined name `ExceptionGroup`
  |
1 | class MyGroup(ExceptionGroup):
  |               ^^^^^^^^^^^^^^ F821
2 |     def derive(self, excs):
3 |         return MyGroup(self.message, excs)
  |

[g3rv4]

seems like a regression from #3167

[charliermarsh]

Do you have a minimum Python version set, in your pyproject.toml or via --target-version? Otherwise, Ruff defaults to Python 3.8, and ExceptionGroup doesn't exist in that version.

[bonastreyair]

maybe it is another issue but for me it fails finding anext when using python3.11
it was working fine with previous version but now it fails because of that

I think the problem comes from here: https://github.com/astral-sh/ruff/pull/13172/files/de081b67c3072829c21cf8176a96baef64793ba7#diff-a5297ef4a78229f14881c57e472a6a79dc17e6a5a9244a676dfa6276d10f0dab

anext was before and now it is not present in that same list: https://github.com/astral-sh/ruff/pull/13172/files/de081b67c3072829c21cf8176a96baef64793ba7#r1746582057

related PR: #13172

[MichaReiser]

@bonastreyair could you share your configuration? anext is still in the builtins list but only when targeting Py310 or newer.

• Py38 -> builtin doesn't exist
• Py311 -> no error

You may need to make a whitespace change for the errors to show up

[bartfeenstra]

I started having similar problems, also with anext() and aiter().

Project.toml: https://github.com/bartfeenstra/betty/blob/0.4.x/pyproject.toml
Ruff failures: https://github.com/bartfeenstra/betty/actions/runs/10734022531/job/29768422099

Let me know if you need more details :)

[iurii-skorniakov]

Found my problem.
I had incorrect configuration in subdirectory, which didn't extend root config.
With correct configuration it works well
Thank you for your help!

[bartfeenstra]

Can we reopen this? I still have this problem, with a single root configuration file:

[lint]
extend-select = [
    'A',
    'B',
    'C4',
    'D',
    'F',
    'INT',
    'PT',
    'PTH',
    'SIM',
    'SLOT',
    'T20',
    'TCH',
]
ignore = [
    'D105',
    'D107',
    'D200',
    'D203',
    'D212',
    'D401',
    'F501',
    'PTH123',
    'SIM103',
]

[lint.per-file-ignores]
"betty/tests/*" = [
    'D100',
    'D101',
    'D102',
    'D103',
    'D104',
    'D106',
]

[MichaReiser]

The fix is to specify the requires-python setting to a version that supports ExceptionGroup.

[bartfeenstra]

requires-python = '~= 3.11' in https://github.com/bartfeenstra/betty/blob/0.4.x/pyproject.toml, yet Ruff fails on ExceptionGroup, aiter, anext... I tried a simpler constraint of requires-python = '>= 3.11' but that did not seem to change Ruff's output.

[MichaReiser]

@bartfeenstra I don't think ruff picks up the requires-python constraint if you also have a .ruff.toml because the .ruff.toml takes precedence. You have to explicitly set the target-version in the ruff.toml. The alternative is to move the ruff configuration into the pyroject.toml.

[bartfeenstra]

That makes sense! I'll give that a try shortly. Thank you!