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bpo-46553: allow bare typing.ClassVar annotations (#30983)

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These are used in the wild and covered by dataclasses unit tests.
Several static type checkers support this pattern.
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Gregory Beauregard 2022-01-28 08:58:39 -08:00 • committed by GitHub
parent 45faf151c6
commit 5445e173e7
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3 changed files with 7 additions and 2 deletions
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Lib/typing.py
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@ -173,7 +173,7 @@ def _type_check(arg, msg, is_argument=True, module=None, *, allow_special_forms=
if (isinstance(arg, _GenericAlias) and
arg.__origin__ in invalid_generic_forms):
raise TypeError(f"{arg} is not valid as type argument")
if arg in (Any, NoReturn, Final):
if arg in (Any, NoReturn, ClassVar, Final):
return arg
if isinstance(arg, _SpecialForm) or arg in (Generic, Protocol):
raise TypeError(f"Plain {arg} is not valid as type argument")