将IP地址字符串转为32位二进制

def str2bin(s):
    temp = s.split('.')
    result = ''
    for i in range(len(temp)):
        temp[i] = str(bin(int(temp[i]))[2:])
        if len(temp[i]) < 8:
            temp[i] = '0'*(8-len(temp[i])) + tenp[i]
        result += str(temp[i])
    return result