fuck_try_catch.py

# -*- coding: utf-8 -*-
from typing import *
from functools import wraps

def exception(f: Callable[[Any], Any]) -> Callable[[Any], Union[Exception, Any]]:
    @wraps(f)
    def wrapper(*args, **kwargs):
        try:
            return f(*args, **kwargs)
        except Exception as e:
            return e
    return wrapper


@exception
def hoge(fuga: int) -> Union[Exception, int]:
    if fuga == 3:
        raise Exception("だめだよ")
    return fuga

if __name__ == '__main__':
    a = hoge(3)
    a = a + 3

# mypy fuck_try_catch.py
# testing.py:23: error: Unsupported operand types for + ("Union[Exception, Any]" and "int")