231. Power of Two (Easy) - TengnanYao/daily_leetcode GitHub Wiki

class Solution(object):
    def isPowerOfTwo(self, n):
        """
        :type n: int
        :rtype: bool
        """
        result = 1
        while result <= n:
            if result == n:
                return True
            else:
                result *= 2
        return False
        
        # # binary solution
        # return n > 0 and (n & n - 1) == 0