What to do when I need to unpack a dictionary?

[Kludex]

I'm trying to add type hints to https://github.com/open-telemetry/opentelemetry-python-contrib, and in a lot of places we have a pattern that is something like:

def to_type_check(fn, args, kwargs):
    return fn(*args, **kwargs)

How do I add type hints to this?

Some playgrounds:

• mypy
• pyright

Also, I can't change how the code looks like, I can only add type hints. It's an old code source.

[TeamSpen210]

Unfortunately ParamSpec only works with exactly *args, **kwargs as inputs, so this isn't possible. If you restrict to only accepting positional arguments variadic generics would work. If these functions are only being used in the implementation and externally it just looks like the original function, perhaps you could just pretend the functions are aliases to users, and leave the implementation untypeable.

[Kludex]

Unfortunately ParamSpec only works with exactly *args, **kwargs as inputs, so this isn't possible. If you restrict to only accepting positional arguments variadic generics would work.

I'm aware of those points, but I'm asking for advice on what I would need to do to here to have it typed correctly.

If the answer is: "it's not possible". Then it seems like something is missing to Python itself, and I'd like to see if we can do something about it.