Python检测IP合法 是否为公网IP

1. 判断IP 格式是否正确

   def check_value(self, ipaddr):
       '''检查IP是否合法
       :param ipaddr:  string
       :return True
       '''
       addr=ipaddr.strip().split('.')
       if len(addr) != 4:
           return False
       for i in range(4):
           try:
               addr[i]=int(addr[i])
           except:
               return False
           if addr[i]<=255 and addr[i]>=0:
               pass
           else:
               return False
           i+=1
       else:
           return True
   

2. 判断是否为公网IP

   from IPy import IP
   if self.check_value(value):
       if IP(value).iptype() is 'PUBLIC':
           return True
   

   ---

   或则直接用netaddr

   from netaddr import *
   ip = IPAddress(value)
   if ip.is_unicast() and not ip.is_private():
   	return True