bpo-44524: Don't modify MRO when inheriting from typing.Annotated (GH-27841)
(cherry picked from commit 23384a1749359f0ae7aaae052073d44b59e715a1)
Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
diff --git a/Lib/typing.py b/Lib/typing.py
index 4935460..423329a 100644
--- a/Lib/typing.py
+++ b/Lib/typing.py
@@ -1573,7 +1573,7 @@ def __init__(self, origin, metadata):
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 @@ def __eq__(self, other):
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.