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gh-101015: Fix typing.get_type_hints with unpacked *tuple (PEP 646) (GH-101031)

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(cherry picked from commit 807d6b576f)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
This commit is contained in:
Miss Islington (bot) 2023-01-23 00:20:15 -08:00 • committed by GitHub
parent 69d12d868e
commit 29ff9daf82
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3 changed files with 36 additions and 1 deletions
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5
Lib/typing.py
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@ -363,10 +363,13 @@ def _eval_type(t, globalns, localns, recursive_guard=frozenset()):
ForwardRef(arg) if isinstance(arg, str) else arg
for arg in t.__args__
)
is_unpacked = t.__unpacked__
if _should_unflatten_callable_args(t, args):
t = t.__origin__[(args[:-1], args[-1])]
else:
t = t.__origin__[args]
if is_unpacked:
t = Unpack[t]
ev_args = tuple(_eval_type(a, globalns, localns, recursive_guard) for a in t.__args__)
if ev_args == t.__args__:
return t
@ -820,7 +823,7 @@ class ForwardRef(_Final, _root=True):
# Unfortunately, this isn't a valid expression on its own, so we
# do the unpacking manually.
if arg[0] == '*':
arg_to_compile = f'({arg},)[0]' # E.g. (*Ts,)[0]
arg_to_compile = f'({arg},)[0]' # E.g. (*Ts,)[0] or (*tuple[int, int],)[0]
else:
arg_to_compile = arg
try: