python检测ip地址的代码(判断ip地址合法性)

[root@yang python]# vi check_ip.py
#!/usr/bin/python
import os,sys
def check_ip(ipaddr):
        import sys
        addr=ipaddr.strip().split('.')  #切割IP地址为一个列表
        #print addr
        if len(addr) != 4:  #切割后列表必须有4个参数
                print "check ip address failed!"
                sys.exit()
        for i in range(4):
                try:
                        addr[i]=int(addr[i])  #每个参数必须为数字，否则校验失败
                except:
                        print "check ip address failed!"
                        sys.exit()
                if addr[i]<=255 and addr[i]>=0:    #每个参数值必须在0-255之间
                        pass
                else:
                        print "check ip address failed!"
                        sys.exit()
                i+=1
        else:
                print "check ip address success!"
if  len(sys.argv)!=2:  #传参加本身长度必须为2
        print "Example: %s 10.0.0.1 "%sys.argv[0]
        sys.exit()
else:
        check_ip(sys.argv[1])  #满足条件调用校验IP函数