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Add _typeshed.sentinel (#10582)

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This commit is contained in:
Sebastian Rittau
2023-08-16 11:31:05 +02:00
committed by GitHub
parent daf51f057b
commit 31ae7b13c7
3 changed files with 29 additions and 2 deletions
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13
stdlib/_typeshed/__init__.pyi
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@@ -36,6 +36,19 @@ Incomplete: TypeAlias = Any
# To describe a function parameter that is unused and will work with anything.
Unused: TypeAlias = object
# Used to mark arguments that default to a sentinel value. This prevents
# stubtest from complaining about the default value not matching.
#
# def foo(x: int | None = sentinel) -> None: ...
#
# In cases where the sentinel object is exported and can be used by user code,
# a construct like this is better:
#
# _SentinelType = NewType("_SentinelType", object)
# sentinel: _SentinelType
# def foo(x: int | None | _SentinelType = ...) -> None: ...
sentinel = Any # noqa: Y026
# stable
class IdentityFunction(Protocol):
def __call__(self, __x: _T) -> _T: ...