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gh-89828: Do not relay the __class__ attribute in GenericAlias (GH-93754)

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list[int].__class__ returned type, and isinstance(list[int], type)
returned True. It caused numerous problems in code that checks
isinstance(x, type).
(cherry picked from commit f9433fff47)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
This commit is contained in:
Miss Islington (bot) 2022-06-18 07:41:25 -07:00 • committed by GitHub
parent 2eff55cd46
commit 579e985e75
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7 changed files with 18 additions and 20 deletions
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Lib/typing.py
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@ -1079,7 +1079,7 @@ class TypeVarTuple(_Final, _Immutable, _PickleUsingNameMixin, _root=True):
var_tuple_index = None
fillarg = None
for k, arg in enumerate(args):
if not (isinstance(arg, type) and not isinstance(arg, GenericAlias)):
if not isinstance(arg, type):
subargs = getattr(arg, '__typing_unpacked_tuple_args__', None)
if subargs and len(subargs) == 2 and subargs[-1] is ...:
if var_tuple_index is not None: