Add Digits – Python 3 (Week 11 – 03)

class Solution:
    def addDigits(self, num: int) -> int:
        
        ans = num
        
        while num > 9:
            ans = 0
            while num > 0:
                ans += num % 10
                num = num // 10
            num = ans
            
        return ans

  class Solution:
    def addDigits(self, num: int) -> int:
        
        if num == 0:
            return 0

        return (num - 1) % 9 + 1