Sum of the digits in a number

def digit_sum(n): total = 0 numberStringfied = str(n) listNumbers = list(numberStringfied) for n in listNumbers: total += int(n) return total
Function that takes a positive integer n as input and returns the sum of all that number's digits.

For example: digit_sum(1234) should return 10 which is 1 + 2 + 3 + 4.

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