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gh-119180: Add annotationlib module to support PEP 649 (#119891)

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Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
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Jelle Zijlstra 2024-07-23 14:16:50 -07:00 • committed by GitHub
parent 64e221d7ad
commit 7b7b90d1ce
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15 changed files with 1815 additions and 510 deletions
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14
Lib/functools.py
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@ -32,7 +32,7 @@ GenericAlias = type(list[int])
# wrapper functions that can handle naive introspection
WRAPPER_ASSIGNMENTS = ('__module__', '__name__', '__qualname__', '__doc__',
'__annotations__', '__type_params__')
'__annotate__', '__type_params__')
WRAPPER_UPDATES = ('__dict__',)
def update_wrapper(wrapper,
wrapped,
@ -882,8 +882,8 @@ def singledispatch(func):
f"Invalid first argument to `register()`. "
f"{cls!r} is not a class or union type."
)
ann = getattr(cls, '__annotations__', {})
if not ann:
ann = getattr(cls, '__annotate__', None)
if ann is None:
raise TypeError(
f"Invalid first argument to `register()`: {cls!r}. "
f"Use either `@register(some_class)` or plain `@register` "
@ -893,13 +893,19 @@ def singledispatch(func):
# only import typing if annotation parsing is necessary
from typing import get_type_hints
argname, cls = next(iter(get_type_hints(func).items()))
from annotationlib import Format, ForwardRef
argname, cls = next(iter(get_type_hints(func, format=Format.FORWARDREF).items()))
if not _is_valid_dispatch_type(cls):
if _is_union_type(cls):
raise TypeError(
f"Invalid annotation for {argname!r}. "
f"{cls!r} not all arguments are classes."
)
elif isinstance(cls, ForwardRef):
raise TypeError(
f"Invalid annotation for {argname!r}. "
f"{cls!r} is an unresolved forward reference."
)
else:
raise TypeError(
f"Invalid annotation for {argname!r}. "