Sum of Two Integers

Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -.

Example: Given a = 1 and b = 2, return 3.

URL: https://leetcode.com/problems/sum-of-two-integers/

class Solution(object):
    def getSum(self, a, b):
        """
        :type a: int
        :type b: int
        :rtype: int
        """
        if b == 0:
            return a
        sum = a ^ b
        carry = (a & b) << 1
        return self.getSum(sum, carry)