67. Add Binary

Given two binary strings, return their sum (also a binary string).

The input strings are both non-empty and contains only characters 1 or 0.

class Solution(object):
    def addBinary(self, a, b):
        """

        :type a: str
        :type b: str
        :rtype: str
        """
        out = int(a, 2) + int(b,2)
        return bin(out)[2:]

以上