Is there a way to have a TypeVar (or some other format) capture all the arguments of a function? For example, say I want to wrap a general function, such that all its arguments are given within a tuple:
def invoke(f: Callable[..., T], args: Tuple[...]) -> T:
return f(*args)
Only that instead of the ellipsis (...), I'll have the static-type inspection enforce the contents of the Tuple to be have the same types as the function's arguments.
Thanks.
The answer is Yes, just not with TypeVar. One should use ParamSpec:
from typing import ParamSpec, TypeVar, Callable
P = ParamSpec('P')
RT = TypeVar('RT')
def invoke(f: Callable[P, RT], args: P.args) -> RT:
return f(*args)
# Or, makes more sense:
def invoke(f: Callable[P, RT], args: P.args, **kwargs: P.kwargs) -> RT:
return f(*args, **kwargs)
Note that for python < 3.10, one should import it from typing_extensions rather than typing.