67.二进制求和（通过）Python

二进制求和最蠢写法（没有用bin()和int()）后边附上使用int和bin版本

class Solution:
    def addBinary(self, a, b):
        """
        :type a: str
        :type b: str
        :rtype: str
        """
        a = list(map(int,list(a)))
        b = list(map(int,list(b)))
        tmp = 0
        res = ''
        while a and b:

            val = a.pop() + b.pop() + tmp
            if val == 3:
                res = str('1') + res
                tmp = 1
            elif val == 2:
                res = str('0') + res
                tmp = 1
            elif val == 1:
                res = str('1') + res
                tmp = 0
            else:
                res = str('0') + res
                tmp = 0
        if len(a) == 0:
            while b:
                cc = b.pop() + tmp
                if cc == 2:
                    res = str('0') + res
                    tmp = 1
                elif cc == 1:
                    res = str('1') + res
                    tmp = 0
                    break
                else:
                    res = str('0') + res
                    tmp = 0
                    break
            b = map(str,b)
            preres = "".join(b)
            
        else:
            while a:
                cc = a.pop() + tmp
                if cc == 2:
                    res = str('0') + res
                    tmp = 1
                elif cc == 1:
                    res = str('1') + res
                    tmp = 0
                    break
                else:
                    res = str('0') + res
                    tmp = 0
                    break
                                
                    
            a = map(str,a)
            preres = "".join(a)
        if tmp == 1:
            result = str(tmp) + preres + res
        else:
            result = preres + res
        return result
        

class Solution:
    def addBinary(self, a, b):
        """
        :type a: str
        :type b: str
        :rtype: str
        """
        a, b = int(a, 2), int(b, 2)
        return bin(a + b)[2:]