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Title: Better match narrowing for irrefutable sequence patterns by hauntsaninja · Pull Request #20782 · python/mypy · GitHub

Open Graph Title: Better match narrowing for irrefutable sequence patterns by hauntsaninja · Pull Request #20782 · python/mypy

X Title: Better match narrowing for irrefutable sequence patterns by hauntsaninja · Pull Request #20782 · python/mypy

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

Open Graph Description: The changes around narrow_sequence_child: implement my suggestion from here: Fix checking of match sequence pattern against bounded type variables #18091 (review) remove an is_subtype check I don&...

X Description: The changes around narrow_sequence_child: implement my suggestion from here: Fix checking of match sequence pattern against bounded type variables #18091 (review) remove an is_subtype check I don&...

Opengraph URL: https://github.com/python/mypy/pull/20782

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Feb 11, 2026https://github.com/python/mypy/pull/20782#issue-3929173936
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Fix checking of match sequence pattern against bounded type variables #18091 (review)https://github.com/python/mypy/pull/18091#pullrequestreview-2411779055
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Better match narrowing for irrefutable sequence patternshttps://github.com/python/mypy/pull/20782/commits/23182415a233de17b03731b85aaef714ce0303d7
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Mypy doesn't narrow a matched object's type (generic or not) based on attribute subpattern match #19081 https://github.com/python/mypy/issues/19081
Better match narrowing for irrefutable mapping patterns #20906 https://github.com/python/mypy/pull/20906
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