diff options
Diffstat (limited to 'Lib')
| -rw-r--r-- | Lib/typing.py | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/Lib/typing.py b/Lib/typing.py index 0983f20..0ff29fa 100644 --- a/Lib/typing.py +++ b/Lib/typing.py @@ -2549,11 +2549,13 @@ Callable = _CallableType(collections.abc.Callable, 2) Callable.__doc__ = \ """Deprecated alias to collections.abc.Callable. - Callable[[int], str] signifies a function of (int) -> str. + Callable[[int], str] signifies a function that takes a single + parameter of type int and returns a str. + The subscription syntax must always be used with exactly two values: the argument list and the return type. - The argument list must be a list of types, a ParamSpec or ellipsis. - The return type must be a single type. + The argument list must be a list of types, a ParamSpec, + Concatenate or ellipsis. The return type must be a single type. There is no syntax to indicate optional or keyword arguments; such function types are rarely used as callback types. |