LeetCode -- ReverseBits binary inversion problem (Python binary, integer conversion)

First look at the mutual conversion between binary and certificate

Integer to binary:

1、采用%2的方式计算  
2、采用python自带了方法 bin().  
比如bin(10) 回返回字符串'0b1010' ，只留下‘0’，‘1’序列需要把‘0b’去掉.  
bin(number).replace('0b','') 或bin(number)[2:]  
>>> bin(10)                     # 为了下边表示方便 放入t中  
'0b1010'  

---

Convert binary to integer:

>>> int(t[2:],2)  
10  

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Reverse bits of a given 32 bits unsigned integer.
For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), return 964176192 (represented in binary as 00111001011110000010100101000000).
Follow up:
If this function is called many times, how would you optimize it?
Related problem: Reverse Integer

class Solution(object):
    def reverseBits(self, n):
        """
        :type n: int
        :rtype: int
        """
        b = bin(n)
        print(b)

        # 不到32位,变成32位
        if len(b) < 34:
            b = '0b' + '0' * (34 - len(b)) + b[2:]

        print(b)
        reversed_b = "0b" + b[2:][::-1]

        return int(reversed_b, 2)


if __name__ == '__main__':
    print(Solution().reverseBits(43261596))