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bpo-40397: Fix subscription of nested generic alias without parameters. (GH-20021)

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Serhiy Storchaka 2020-05-10 13:39:40 +03:00 • committed by GitHub
parent 86a93fddf7
commit 0122d48681
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2 changed files with 16 additions and 3 deletions
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6
Lib/typing.py
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@ -702,8 +702,10 @@ class _GenericAlias(_BaseGenericAlias, _root=True):
if isinstance(arg, TypeVar):
arg = subst[arg]
elif isinstance(arg, (_GenericAlias, GenericAlias)):
subargs = tuple(subst[x] for x in arg.__parameters__)
arg = arg[subargs]
subparams = arg.__parameters__
if subparams:
subargs = tuple(subst[x] for x in subparams)
arg = arg[subargs]
new_args.append(arg)
return self.copy_with(tuple(new_args))