the instrucions are:
Write a function called digit_sum 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.
(Assume that the number you are given will always be positive.)
this is my code:
def digit_sum(n): y = str(n) summa = 0 for ch in y: f = summa + int(ch) summa.append(f) return summa
thank you for your help