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.
Wondering why my code below isn’t working. Please help. (local variable ‘sum’ referenced before assignment on line 5)
sum = 0 def digit_sum(n): number = str(n) for digit in number: sum = sum + int(digit) return sum print(digit_sum(1234))