class Solution(object):
def isPowerOfTwo(self, n):
"""
:type n: int
:rtype: bool
"""
if n == 0:
return False
while n & 1 == 0:
n = n >> 1
return n == 1
https://leetcode.com/problems/power-of-two/
Given an integer, write a function to determine if it is a power of two.