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Reduce duplication of code between typing and typing_extensions (#7075)

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This commit is contained in:
Alex Waygood
2022-01-29 15:44:42 +00:00
committed by GitHub
parent 54eef59fe4
commit 99cec2d16b
4 changed files with 13 additions and 15 deletions
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11
stdlib/typing.pyi
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@@ -29,6 +29,7 @@ class TypeVar:
# Used for an undocumented mypy feature. Does not exist at runtime.
_promote = object()
# N.B. Keep this definition in sync with typing_extensions._SpecialForm
class _SpecialForm:
def __getitem__(self, typeargs: Any) -> object: ...
if sys.version_info >= (3, 10):
@@ -138,13 +139,9 @@ if sys.version_info >= (3, 9):
# Predefined type variables.
AnyStr = TypeVar("AnyStr", str, bytes) # noqa: Y001
if sys.version_info >= (3, 8):
# This class did actually exist in 3.7, but had a different base.
# We'll just pretend it didn't exist though: the main external use case for _ProtocolMeta is
# to inherit from for your own custom protocol metaclasses. If you're using 3.7, at runtime
# you'd use typing_extensions.Protocol, which would be unrelated to typing._ProtocolMeta and
# so you'd run into metaclass conflicts at runtime if you used typing._ProtocolMeta.
class _ProtocolMeta(ABCMeta): ...
# Technically in 3.7 this inherited from GenericMeta. But let's not reflect that, since
# type checkers tend to assume that Protocols all have the ABCMeta metaclass.
class _ProtocolMeta(ABCMeta): ...
# Abstract base classes.