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gh-111729: update generic syntax for typing.Concatenate sample code in Doc/library/typing.rst (#111734)

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use new generic syntax
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方糖 2023-11-07 08:53:17 +08:00 • committed by GitHub
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Doc/library/typing.rst
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@ -1145,16 +1145,13 @@ These can be used as types in annotations. They all support subscription using
from collections.abc import Callable from collections.abc import Callable
from threading import Lock from threading import Lock
from typing import Concatenate, ParamSpec, TypeVar from typing import Concatenate
P = ParamSpec('P')
R = TypeVar('R')
# Use this lock to ensure that only one thread is executing a function # Use this lock to ensure that only one thread is executing a function
# at any time. # at any time.
my_lock = Lock() my_lock = Lock()
def with_lock(f: Callable[Concatenate[Lock, P], R]) -> Callable[P, R]: def with_lock[**P, R](f: Callable[Concatenate[Lock, P], R]) -> Callable[P, R]:
'''A type-safe decorator which provides a lock.''' '''A type-safe decorator which provides a lock.'''
def inner(*args: P.args, **kwargs: P.kwargs) -> R: def inner(*args: P.args, **kwargs: P.kwargs) -> R:
# Provide the lock as the first argument. # Provide the lock as the first argument.