Hamming Distance — Python

# Time:  O(1)
# Space: O(1)

class Solution(object):
    def hammingDistance(self, x, y):
        """
        :type x: int
        :type y: int
        :rtype: int
        """
        distance = 0
        z = x ^ y
        while z:
            distance += 1
            z &= z - 1
        return distance

    def hammingDistance2(self, x, y):
        """
        :type x: int
        :type y: int
        :rtype: int
        """
        return bin(x ^ y).count('1')