An example of function argument validation without using pydantic validate_arguments decorator

non_pydantic_argument_validation.py

import math
from typing import Union


def get_hypotenuse(a: Union[int, float], b: Union[int, float]) -> float:
    if not isinstance(a, (float, int)):
        raise TypeError
    if not isinstance(b, (float, int)):
        raise TypeError

    # since we are going to square the value the test could just check that the value is 0
    # but a user sending a negative value... it is not a good sign
    # we better have to send him a feedback
    if a <= 0:
        raise ValueError
    if b <= 0:
        raise ValueError

    return math.sqrt(a ** 2 + b ** 2)


print(get_hypotenuse(1, 2))