Example of a method that USES Python to determine the validity of an IP address

I. use method and implementation effect see the figure:
< img border = 0 id = theimg onclick = window. The open this. (SRC) SRC = "/ / files.jb51.net/file_images/article/201403/201431392344653.jpg? 20142139244 ">
Ii. Python implementation code

[root@yang python]# vi check_ip.py 
#!/usr/bin/python 
import os,sys 
def check_ip(ipaddr): 
        import sys 
        addr=ipaddr.strip().split('.')  # cutting IP The address is a list  
        #print addr 
        if len(addr) != 4:  # After cutting the list must have 4 A parameter  
                print "check ip address failed!"
                sys.exit() 
        for i in range(4): 
                try: 
                        addr[i]=int(addr[i])  # Each parameter must be a number, otherwise the check fails  
                except: 
                        print "check ip address failed!"
                        sys.exit() 
                if addr[i]<=255 and addr[i]>=0:    # Each parameter value must be in 0-255 between  
                        pass
                else: 
                        print "check ip address failed!"
                        sys.exit() 
                i+=1
        else: 
                print "check ip address success!"
if  len(sys.argv)!=2:  # The length of the pass itself must be 2 
        print "Example: %s 10.0.0.1 "%sys.argv[0] 
        sys.exit() 
else: 
        check_ip(sys.argv[1])  # It satisfies the condition to call the checksum IP function