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python实现判断一个字符串是否是合法IP地址

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Lepaskan： 2018-06-04 16:13:58

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一个刚结束的笔试题目，简单贴一下吧，下面是具体实现：

#!usr/bin/env python
#encoding:utf-8
&#39;&#39;&#39;
__Author__:沂水寒城
功能：判断一个字符串是否是合法IP地址
&#39;&#39;&#39;
import re
def judge_legal_ip(one_str):
  &#39;&#39;&#39;
  正则匹配方法
  判断一个字符串是否是合法IP地址
  &#39;&#39;&#39;
  compile_ip=re.compile(&#39;^((25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(25[0-5]|2[0-4]\d|[01]?\d\d?)$&#39;) 
  if compile_ip.match(one_str): 
    return True 
  else: 
    return False 
def judge_legal_ip2(one_str):
  &#39;&#39;&#39;
  简单的字符串判断
  &#39;&#39;&#39;
  if &#39;.&#39; not in one_str:
    return False
  elif one_str.count(&#39;.&#39;)!=3:
    return False
  else:
    flag=True
    one_list=one_str.split(&#39;.&#39;)
    for one in one_list:
      try:
        one_num=int(one)
        if one_num>=0 and one_num<=255:
          pass
        else:
          flag=False
      except:
        flag=False
    return flag
          
if __name__==&#39;__main__&#39;:
  ip_list=[&#39;&#39;,&#39;172.31.137.251&#39;,&#39;100.10.0.1000&#39;,&#39;1.1.1.1&#39;,&#39;12.23.13&#39;,&#39;aa.12.1.2&#39;,&#39;12345678&#39;,&#39;289043jdhjkbh&#39;]
  for one_str in ip_list:
    if judge_legal_ip(one_str): #正则方法
    #if judge_legal_ip2(one_str): #字符串方法
      print &#39;{0} is a legal ip address!&#39;.format(one_str)
    else:
      print &#39;{0} is not a legal ip address!&#39;.format(one_str)

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结果如下：

is not a legal ip address! 
172.31.137.251 is a legal ip address! 
100.10.0.1000 is not a legal ip address! 
1.1.1.1 is a legal ip address! 
12.23.13 is not a legal ip address! 
aa.12.1.2 is not a legal ip address! 
12345678 is not a legal ip address! 
289043jdhjkbh is not a legal ip address!

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