class typing.Callable
Callable type; Callable[[int], str]
is a function of (int) -> 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; 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. Callable[..., ReturnType]
could be used to type hint a callable taking any number of arguments and returning ReturnType
. A plain Callable
is equivalent to Callable[..., Any]
.
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