Get the sum of digits in a non-negative integer

Get the sum of digits in non-negative integer.

Test Data:

sumDigits(345) -> 12

sumDigits(45) -> 9

def sum_digits(N):
    if N == 0:
        return 0
    else:
        return N % 10 + sum_digits(int(N / 10))

# test
print(sum_digits(345))    # 12
print(sum_digits(45))     # 9

See also

https://www.w3resource.com/python-exercises/data-structures-and-algorithms/python-recursion-exercise-6.php