import inspect

a = 2
b = 3
c = 4


def func(a: int, c: int) -> int:
    return a + c


arg_names = inspect.getfullargspec(func).args
print(arg_names)  # ['a', 'c']

arguments = {arg: globals()[arg] for arg in arg_names if arg in globals()}
print(arguments)  # {'a': 2, 'c': 4}

result = func(**arguments)
print(result)  # 6