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fix: replace assert with proper exception in python_build_standalone - #2859
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henryiii merged 1 commit intoMay 17, 2026
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Assert statements are skipped under python -O, making them unsuitable for runtime validation. Replace assert with an explicit check that raises PythonBuildStandaloneError if the target directory already exists. Assisted-by: OpenCode:glm-5
agriyakhetarpal
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May 16, 2026
agriyakhetarpal
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Thanks! I think it might be a good idea to add S101: https://docs.astral.sh/ruff/rules/assert/
joerick
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May 16, 2026
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I'd be opposed to S101 - asserts are mighty useful to check for programmer mistakes, and handy to tell the type system something that you as a programmer know to be true. |
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@joerick oh, the idea would be to add S101 for the source directories only – not the test directories, because we need assert statements there. Like this: |
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Assert is used to narrow type checkers. The AI was able to detect a usage that was not for type checking, but the general ruff check can't do that. |
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See #2854.
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Summary
Replaces
assert not python_base_dir.exists()incibuildwheel/util/python_build_standalone.py:178with an explicit check that raisesPythonBuildStandaloneError. Assert statements are skipped underpython -O, making them unsuitable for runtime validation.Identified in #2854 ("Uses assert for runtime validation — It is skipped with
python -O").Assisted-by: OpenCode:glm-5