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bpo-41370: Evaluate strings as forward refs in PEP 585 generics (GH-30900)

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This removes discrepancy between list["int"] and List["int"].

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
This commit is contained in:
Niklas Rosenstein 2022-03-07 19:02:59 +01:00 • committed by GitHub
parent 77446d2aa5
commit b465b60604
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3 changed files with 49 additions and 2 deletions
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6
Lib/typing.py
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@ -336,6 +336,12 @@ def _eval_type(t, globalns, localns, recursive_guard=frozenset()):
if isinstance(t, ForwardRef):
return t._evaluate(globalns, localns, recursive_guard)
if isinstance(t, (_GenericAlias, GenericAlias, types.UnionType)):
if isinstance(t, GenericAlias):
args = tuple(
ForwardRef(arg) if isinstance(arg, str) else arg
for arg in t.__args__
)
t = t.__origin__[args]
ev_args = tuple(_eval_type(a, globalns, localns, recursive_guard) for a in t.__args__)
if ev_args == t.__args__:
return t