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Title: Extend special case for context-based typevar inference to typevar unions in return position by sterliakov · Pull Request #18976 · python/mypy · GitHub

Open Graph Title: Extend special case for context-based typevar inference to typevar unions in return position by sterliakov · Pull Request #18976 · python/mypy

X Title: Extend special case for context-based typevar inference to typevar unions in return position by sterliakov · Pull Request #18976 · python/mypy

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

Open Graph Description: Fixes wrongly reported typing error in min with key lambda function and default value when result is Optional #17221. Fixes [arg-type] wrong argument type in generic function with union #17654. Fix...

X Description: Fixes wrongly reported typing error in min with key lambda function and default value when result is Optional #17221. Fixes [arg-type] wrong argument type in generic function with union #17654. Fix...

Opengraph URL: https://github.com/python/mypy/pull/18976

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Extend special case for context-based typevar inference to typevar unions in return positionhttps://github.com/python/mypy/pull/18976#top
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Apr 26, 2025https://github.com/python/mypy/pull/18976#issue-3022138467
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wrongly reported typing error in min with key lambda function and default value when result is Optional #17221https://github.com/python/mypy/issues/17221
[arg-type] wrong argument type in generic function with union #17654https://github.com/python/mypy/issues/17654
(🐞) generics not resolving correctly when multiple TypeVars don't meet the expected type #17553https://github.com/python/mypy/issues/17553
min()/max() with default value cause issues with key function type #17536https://github.com/python/mypy/issues/17536
Function returning union of type variables has inference/unification behaviour change when assigned to explicitly-typed location #16659https://github.com/python/mypy/issues/16659
Type inference for max() "tainted" by default #16267https://github.com/python/mypy/issues/16267
Inference failure in return statement with next and or #15755https://github.com/python/mypy/issues/15755
itertools' all_equal recipe causes false arg-type failures #15150https://github.com/python/mypy/issues/15150
False "Invalid index type" for min derived from return type #14664https://github.com/python/mypy/issues/14664
Misleading warning for generic argument type on wrong return type #12156https://github.com/python/mypy/issues/12156
Unneeded type widening of inner function call when using explicit return type #12092https://github.com/python/mypy/issues/12092
Typechecking differs between one-line def of "return expr" vs. "r = expr; return r" #11985https://github.com/python/mypy/issues/11985
generics inferred differently when assigning to variable even though the variable's type is the same #11455https://github.com/python/mypy/issues/11455
False positive for lambda within a function #10426https://github.com/python/mypy/issues/10426
sterliakov/mypy-issues#30https://github.com/sterliakov/mypy-issues/issues/30
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April 26, 2025 19:09https://github.com/python/mypy/pull/18976#commits-pushed-c4baf4e
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Extend special-case for context-based typevar inference in return pos…https://github.com/python/mypy/pull/18976/commits/c4baf4ed23b0648198f6e3e32a3d591d850d081c
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Add missing get_proper_typehttps://github.com/python/mypy/pull/18976/commits/83315466d5114cd61cbe993c9a17389a91dcaef2
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Fix a regression with mapping.get(key, default_singleton)https://github.com/python/mypy/pull/18976/commits/7fcae0f3ed168eb8044bfb58d6276ebd3b82e385
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Switch to detecting *any* typevar in union in return position - `T | …https://github.com/python/mypy/pull/18976/commits/43c097c4e8ee7889ba256a0d161368cc0cf6ab61
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Revert attempt to fix Mapping.gethttps://github.com/python/mypy/pull/18976/commits/e3771159078378eb1a2cfc047c959305e0ef40d9
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Revert to all() - inferring for unions of typevar and something see…https://github.com/python/mypy/pull/18976/commits/3f04d8ee0ad7807867ea952036930d65165df5e2
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Only consider meta variables in ambiguous "any of" constraints #18986 https://github.com/python/mypy/pull/18986
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Only consider meta variables in ambiguous "any of" constraints (https://github.com/python/mypy/commit/f3367260eaeee9cb67ca2bd4ca3929e9c0d7a9af
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Merge branch 'master' into bugfix/https://github.com/python/mypy/pull/18976/commits/01cbfbcf89cd9d7de5a853bfe13c2cc5138edf08
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Remove xfail test - fixed in previous PRhttps://github.com/python/mypy/pull/18976/commits/f1e4dfc60f60ecd64d073dcc519939d5fea023e7
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Merge branch 'master' into bugfix/https://github.com/python/mypy/pull/18976/commits/8b5d1404487270017097721226856204ddbae779
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Avoid false unreachable, redundant-expr, and redundant-casts warnings in loops more robustly and efficiently, and avoid multiple revealed type notes for the same line. #19118 https://github.com/python/mypy/pull/19118
Nondeterministic type checking on pytorch/vision #19121 https://github.com/python/mypy/issues/19121
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Update mypy to 1.17.0 archlinux/archinstall#3671 https://github.com/archlinux/archinstall/pull/3671
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upnext https://github.com/python/mypy/issues?q=state%3Aopen%20label%3Aupnext
itertools' all_equal recipe causes false arg-type failures https://github.com/python/mypy/issues/15150
False "Invalid index type" for min derived from return type https://github.com/python/mypy/issues/14664
Unneeded type widening of inner function call when using explicit return type https://github.com/python/mypy/issues/12092
Typechecking differs between one-line def of "return expr" vs. "r = expr; return r" https://github.com/python/mypy/issues/11985
False positive for lambda within a function https://github.com/python/mypy/issues/10426
Inference failure in return statement with next and or https://github.com/python/mypy/issues/15755
Type inference for max() "tainted" by default https://github.com/python/mypy/issues/16267
Function returning union of type variables has inference/unification behaviour change when assigned to explicitly-typed location https://github.com/python/mypy/issues/16659
wrongly reported typing error in min with key lambda function and default value when result is Optional https://github.com/python/mypy/issues/17221
min()/max() with default value cause issues with key function type https://github.com/python/mypy/issues/17536
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