颠倒二进制位

主要考察的知识点为进制间的转换

class Solution:
    # @param n, an integer
    # @return an integer
    # 颠倒二进制位
    def reverseBits(self, n):
        b = [i for i in str(bin(n))[2:].rjust(32,"0")][::-1]
        r = ""
        for i in b:
            r += i
#         print(r)
        return int(r,2)