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bpo-44524: Don't modify MRO when inheriting from typing.Annotated (GH-27841)

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(cherry picked from commit 23384a1749)

Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
This commit is contained in:
Miss Islington (bot) 2021-08-25 11:36:47 -07:00 • committed by GitHub
parent ec5a03168f
commit 06e9a35169
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2 changed files with 11 additions and 1 deletions
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7
Lib/typing.py
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@ -1573,7 +1573,7 @@ class _AnnotatedAlias(_GenericAlias, _root=True):
if isinstance(origin, _AnnotatedAlias):
metadata = origin.__metadata__ + metadata
origin = origin.__origin__
super().__init__(origin, origin, name="Annotated")
super().__init__(origin, origin)
self.__metadata__ = metadata
def copy_with(self, params):
@ -1601,6 +1601,11 @@ class _AnnotatedAlias(_GenericAlias, _root=True):
def __hash__(self):
return hash((self.__origin__, self.__metadata__))
def __getattr__(self, attr):
if attr in {'__name__', '__qualname__'}:
return 'Annotated'
return super().__getattr__(attr)
class Annotated:
"""Add context specific metadata to a type.