leetcode Power of Two

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原题链接：https://leetcode.com/problems/power-of-two/

Description

Given an integer, write a function to determine if it is a power of two.
水一发python。。

class Solution(object):    def isPowerOfTwo(self, n):        shift = 1        if n == 1 or n == 2:            return True        while shift < n:            shift <<= 1        return shift == n

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