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Title: Support narrowing literals and enums using the in operator in combination with list, set, and tuple expressions. by tyralla · Pull Request #17044 · python/mypy · GitHub

Open Graph Title: Support narrowing literals and enums using the in operator in combination with list, set, and tuple expressions. by tyralla · Pull Request #17044 · python/mypy

X Title: Support narrowing literals and enums using the in operator in combination with list, set, and tuple expressions. by tyralla · Pull Request #17044 · python/mypy

Description: Optional static typing for Python. Contribute to python/mypy development by creating an account on GitHub.

Open Graph Description: Note: This PR initially dealt only with tuple expressions. The general idea is to transform expressions like (x is None) and (x in (1, 2)) and (x not in (3, 4)) into (x is None) and (x == 1 or x =...

X Description: Note: This PR initially dealt only with tuple expressions. The general idea is to transform expressions like (x is None) and (x in (1, 2)) and (x not in (3, 4)) into (x is None) and (x == 1 or x =...

Opengraph URL: https://github.com/python/mypy/pull/17044

X: @github

direct link

Domain: github.com

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Optional[Expression] -> Expression | Nonehttps://github.com/python/mypy/pull/17044/commits/2fa954a1f28f59b6d633eddc264690a68766d121
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fix mypyc crashhttps://github.com/python/mypy/pull/17044/commits/8785fe9b157d819d79ccfb15639127f18c7f201b
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Also support list expressions.https://github.com/python/mypy/pull/17044/commits/44d71ebb77a28027c75c1a0cde85ecc915834b08
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Also support set expressions.https://github.com/python/mypy/pull/17044/commits/a04126d821a74b12ab5578991a170f67c8cf8500
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==-based narrowing of Optional #18135 https://github.com/python/mypy/issues/18135
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