【每日一练】Ipv4地址合法性检测

ip地址规范：

ip地址的规范为（1～255）.（0～255）.（0～255）

ip地址验证：

方法一：字符串切割，截取

 1 #!/usr/bin/env python3
 2 # -*- coding:utf-8 -*-
 3 """
 4 code is far away from bugs with the god animal protecting
 5                  ☃ 神兽保佑,永无BUG！
 6 """
 7 
 8 import sys
 9 
10 
11 def verify_ip(ip):
12     Addr = ip.split('.')
13     if len(Addr) != 4:
14         print('Ip address need four parts.')
15         sys.exit()
16     for i, item in enumerate(Addr):
17         if len(item) > 3:
18             print('%d part is error enter' % (i+1))
19             sys.exit()
20         try:
21             item = int(item)
22         except:
23             print('Ip address must be digit.')
24             sys.exit()
25 
26         if 1-int(bool(i)) <= item <= 255:
27             pass
28         else:
29             print('Illegal ip address')
30             sys.exit()
31     else:
32         print('Legal ip address')
33 
34 
35 if __name__ == '__main__':
36     if len(sys.argv) != 2:
37         print('Error enter, examples : %s 255.255.255.0' % sys.argv[0])
38         sys.exit()
39     else:
40         verify_ip(sys.argv[1])
# run
 1 # ./IP_Verify.py 
 2 　　Error enter, examples :/IP_Verify.py 255.255.255.255
 3  # ./IP_Verify.py  255.255.255.0
 4  　　Legal ip address
 5  # ./IP_Verify.py  0.0.0.0
 6    　Illegal ip address
 7  # ./IP_Verify.py  255.255.255
 8  　　Ip address need four parts.
 9  # ./IP_Verify.py  255.255.255.a
10  　　Ip address must be digit.
11 # ./IP_Verify.py 255.255.255.256
12  　　Illegal ip address

 

方法二：正则表达式

posted @ 2018-09-26 16:09  木石溪  阅读(1321)  评论(0)  编辑  收藏  举报