python实现判断一个字符串是否是合法IP地址的示例

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'''__Author__:沂水寒城功能：判断一个字符串是否是合法IP地址'''import redef judge_legal_ip(one_str): ''' 正则匹配方法 判断一个字符串是否是合法IP地址 ''' compile_ip=re.compile('^((25[0-5]|2[0-4]/d|[01]?/d/d?)/.){3}(25[0-5]|2[0-4]/d|[01]?/d/d?)$')  if compile_ip.match(one_str):   return True  else:   return False def judge_legal_ip2(one_str): ''' 简单的字符串判断 ''' if '.' not in one_str:  return False elif one_str.count('.')!=3:  return False else:  flag=True  one_list=one_str.split('.')  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__=='__main__': ip_list=['','172.31.137.251','100.10.0.1000','1.1.1.1','12.23.13','aa.12.1.2','12345678','289043jdhjkbh'] 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 '{0} is a legal ip address!'.format(one_str)  else:   print '{0} is not a legal ip address!'.format(one_str)

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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