https://leetcode.com/problems/number-complement/

s.py

class Solution(object):
    def findComplement(self, num):
        """
        :type num: int
        :rtype: int
        """
        binary = [int(i) ^ 1 for i in bin(num)[2:]]
        return int("".join(map(str,binary)),2)
'''
Runtime: 12 ms, faster than 89.42% of Python online submissions for Number Complement.
Memory Usage: 11.9 MB, less than 14.29% of Python online submissions for Number Complement.
'''