Sum Digits 1 def sum_digits(n): 2 """Calculates the sum of the digits n 3 >>sum_digits(8) 4 8 5 >>sum_digits(18) 6 9 7 >>sum_digits(2018) 8 11 9 111111 10 if n 10: 11 return n 12 else: 13 all_but_last,last n /10,n 10 14 return sum_digits(all_but_last)+lastSum Digits 1 def sum_digits(n): 2 """Calculates the sum of the digits n 3 >>> sum_digits(8) 4 8 5 >>> sum_digits(18) 6 9 7 >>> sum_digits(2018) 8 11 9 """ 10 if n < 10: 11 return n 12 else: 13 all_but_last, last = n // 10, n % 10 14 return sum_digits(all_but_last) + last