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gh-105499: Defer "import warnings" in typing by JelleZijlstra · Pull Request #132061 · python/cpython · GitHub

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gh-105499: Defer "import warnings" in typing #132061

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Merged
JelleZijlstra merged 1 commit into from
Apr 4, 2025
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gh-105499: Defer "import warnings" in typing #132061

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5 changes: 4 additions & 1 deletion Lib/typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,6 @@
import sys
import types
from types import GenericAlias
import warnings

from _typing import (
_idfunc,
Expand Down Expand Up @@ -1626,14 +1625,17 @@ def __getitem__(self, params):

class _UnionGenericAliasMeta(type):
def __instancecheck__(self, inst: object) -> bool:
import warnings
warnings._deprecated("_UnionGenericAlias", remove=(3, 17))
return isinstance(inst, Union)

def __subclasscheck__(self, inst: type) -> bool:
import warnings
warnings._deprecated("_UnionGenericAlias", remove=(3, 17))
return issubclass(inst, Union)

def __eq__(self, other):
import warnings
warnings._deprecated("_UnionGenericAlias", remove=(3, 17))
if other is _UnionGenericAlias or other is Union:
return True
Expand All @@ -1650,6 +1652,7 @@ class _UnionGenericAlias(metaclass=_UnionGenericAliasMeta):

"""
def __new__(cls, self_cls, parameters, /, *, name=None):
import warnings
warnings._deprecated("_UnionGenericAlias", remove=(3, 17))
return Union[parameters]

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