playing_with_errors.py

import typing


def safer_execute(method: typing.Callable[[typing.Any, typing.Optional[typing.Dict[str, typing.Any]]], typing.Any],
                  errors: typing.List[typing.Type[Exception]],
                  *args, default=None, **kwargs):
    try:
        return method(*args, **kwargs)
    except tuple(errors):
        if callable(default):
            return default(*args, **kwargs)
        return default


conversion_errors = [
    # value could not be converted to a float
    ValueError,
    # value was zero
    ZeroDivisionError,
    # value was None
    # TypeError
]


def div(count, total):
    return (float(count) / float(total)) * 100


if __name__ == '__main__':
    a = safer_execute(div, conversion_errors, 'not a float', 1, default=0)
    print(f"A: {a:.0f} %")
    b = safer_execute(div, conversion_errors, 12, 0)
    print(f"B: {b}")
    c = safer_execute(div, conversion_errors, 2, 10, default=0)
    print(f"C: {c:.0f} %")

    # note we are not catching the `TypeError` so it will trigger an exception
    d = safer_execute(div, conversion_errors, None, None, default=0)
    print(f"D: {d:.0f} %")