python基础：5.请编写一个函数实现将IP地址转换成一个整数。

如 10.3.9.12 转换规则为：
10 00001010
  3 00000011 
9 00001001
  12 00001100 
再将以上二进制拼接起来计算十进制结果：00001010 00000011 00001001 00001100 = ？

 1 class Switch(object):
 2 
 3     def __init__(self, ip_str):
 4         self.ip_str = ip_str
 5 
 6     def ten_switch_two(self, num):
 7         demo = list()
 8         while num > 0:
 9             ret = num % 2
10             demo.append(str(ret))
11             num = num // 2
12         temp = "".join((list(reversed(demo))))
13         head_zero = "0"*(8-len(temp))
14         ret = head_zero + temp
15         return ret
16 
17     def two_switch_ten(self, num):
18         # 字符串转列表
19         num_list = list()
20         for i in num:
21             num_list.append(i)
22         temp = 0
23         s = len(num_list) - 1
24         for i in num_list:
25             temp += int(i) * 2 ** s
26             s -= 1
27         return temp
28 
29     def run(self):
30         # 1.切割字符串
31         part_list = self.ip_str.split(".")
32         # 2.循环取出每个数字转成二进制数
33         temp_str = ""
34         for ip_part in part_list:
35             temp_str += self.ten_switch_two(int(ip_part))
36         ret = self.two_switch_ten(temp_str)
37         print(ret)