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[flake8-simplify] Suppress SIM105 for except* before Python 3.12#23869

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getehen wants to merge 2 commits intoastral-sh:mainfrom
getehen:fix/SIM105-disabled-py311
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[flake8-simplify] Suppress SIM105 for except* before Python 3.12#23869
getehen wants to merge 2 commits intoastral-sh:mainfrom
getehen:fix/SIM105-disabled-py311

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@getehen
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@getehen getehen commented Mar 10, 2026

Hi,

Fix 23798 : SIM105 should not be active before py 3.12.

The solution is simple: If the target version is lower or equal than 3.11, the check is passed.
There might be a caveat: I am not sure the target version is always 100% valid ? But it seemed the most accurate thing to use here.

Some tests were added, checking in 3.12 and 3.11 to check that the test suppression happen in 3.11 but not in 3.12.

I can also add a mention in the docs ? If so, should I do this directly here ?

@astral-sh-bot astral-sh-bot bot requested a review from ntBre March 10, 2026 14:59
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astral-sh-bot bot commented Mar 10, 2026

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

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This fix doesn't appear to be correct. I checked the ecosystem report and regular except handlers (with just except) are no longer being flagged. The issue is specific to except* handlers like that shown in the issue:

def raise_group(x):
    raise ExceptionGroup("!", [ValueError(x)])
try:
   raise_group(1)
except* ValueError:  # This needs to be skipped
   pass

try: ...
except ValueError: # This should still emit a diagnostic
    pass

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getehen commented Mar 11, 2026

My bad, I will look into it

For py311, suppressible-exception should not be raised with except* (in
my previous commit I disabled it with every except, independently of the
*, which is wrong).

New tests accordingly.
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Thank you! This looks good to me now, I just had one suggestion about testing.

Path::new("flake8_simplify").join(path).as_path(),
&settings::LinterSettings::for_rule(rule_code).with_target_version(py_version),
)?;
assert_diagnostics!(snapshot, diagnostics);
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I think this would be a good use of our assert_diagnostics_diff! macro instead of two separate test_cases.

@ntBre ntBre changed the title [flake8-simplify] Make SIM105 invalid for py <= 3.11 [flake8-simplify] Suppress SIM105 for except* before Python 3.12 Mar 12, 2026
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SIM105 should be suppressed for except* in Python 3.11

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