summing digits of a number

[volcano63]

Now, that you have solved it - let me show you a Pythonic solution (works on 3.x only)

def sum_digits(number):
    digits_sum = 0
    while number:
        digit, *number = number
        digits_sum += int(digit)
    return digits_sum

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PS Actually, while is less suitable than for in this case

def sum_digits(number):
    digits_sum = 0
    for digit in number:
        digits_sum += int(digit)
    return digits_sum

or in the shortest form, just

sum(map(int, number))

The latter, of course, takes time to get used to - unless you are a mathematician