Add check for comparisons like None in list/set/tuple
#17154
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…riables to not include None
for more information, see https://pre-commit.ci
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…ed at the end of the if condition (preventing exceptions if right has no attribute "items")
…' into detect-None-in-default-iterables
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The new feature is ready and I tested it on all kinds of code samples, but something in the automatic tests that I added in the check-optional.test file got stuck. |
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
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Are there plans to merge this PR? Would be a great feature! |
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Implements #17152
Fixes #17149
Summary
This PR adds to mypy the ability to recognize conditions like
if None in [a, b, c]:and refine the types ofa, b, cin the relevant scope. The supported expressions areListExpr, TupleExpr, SetExpr.