Interpret bare ClassVar as inferred, not Any #19573
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I checked the new errors are correct (previously bare |
sterliakov
reviewed
Aug 3, 2025
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| class C: | ||
| x: ClassVar = 1 | ||
| y: ClassVar |
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Okay, can we reject at least this in --disallow-any-generics fashion? Doesn't look like something I want to see in typed code silently...
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Yeah, good point. We should reject this with --disallow-any-generics.
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Diff from mypy_primer, showing the effect of this PR on open source code: sphinx (https://github.com/sphinx-doc/sphinx)
+ sphinx/ext/autodoc/_documenters.py: note: In member "_load_object_by_name" of class "Documenter":
+ sphinx/ext/autodoc/_documenters.py:247:21: error: Argument "objtype" to "_load_object_by_name" has incompatible type "str"; expected "Literal['module', 'class', 'exception', 'function', 'decorator', 'method', 'property', 'attribute', 'data']" [arg-type]
black (https://github.com/psf/black)
+ src/black/trans.py:346:38: error: Variable "black.trans.CustomSplitMapMixin._Key" is not valid as a type [valid-type]
+ src/black/trans.py:346:38: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
+ src/black/trans.py:351:2: error: Variable "black.trans.CustomSplitMapMixin._Key" is not valid as a type [valid-type]
+ src/black/trans.py:351:2: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
trio (https://github.com/python-trio/trio)
+ src/trio/_tests/test_ssl.py:217: error: Item "None" of "Any | None" has no attribute "SSL_OP_NO_TLSv1_3" [union-attr]
scipy-stubs (https://github.com/scipy/scipy-stubs)
+ scipy-stubs/_lib/_ccallback.pyi:54: error: All protocol members must have explicitly declared types [misc]
+ scipy-stubs/_lib/_ccallback.pyi:55: error: All protocol members must have explicitly declared types [misc]
+ scipy-stubs/_lib/_ccallback.pyi:76: error: All protocol members must have explicitly declared types [misc]
+ scipy-stubs/_lib/_ccallback.pyi:83: error: All protocol members must have explicitly declared types [misc]
+ scipy-stubs/_lib/_ccallback.pyi:84: error: All protocol members must have explicitly declared types [misc]
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sterliakov
approved these changes
Aug 3, 2025
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Fixes #5587
Apparently, it is part of the spec now. cc @JukkaL