根据IP地址和子网掩码算出网段

#!/usr/bin/env python
#_*_encoding:utf-8_*_
#Input your ip address and netmask to figure out your network .
#申明：此脚本为交互式，默认情况下请执行python network.py
from IPy import IP
input_IP = raw_input('请输入ip地址:')
list1 = input_IP.split('.')
if len(list1) != 4:
	print "您输入的ip地址不合法，请重新输入！"
	exit()
for i in list1:
	if i.isdigit() == True and int(i) >=0  and int(i) <= 255:
		pass
	else:
		print "您输入的ip地址不合法，请重新输入！"
		exit()
input_Netmask = raw_input('请输入子网掩码:')
list2 = input_Netmask.split('.')
if len(list2) != 4:
	print "您输入的子网掩码不合法，请重新输入!"
	exit()
for i in list2:
	if i.isdigit() == True and int(i) >=0  and int(i) <= 255:
		pass
	else:
		print "您输入的子网掩码不合法，请重新输入!"
		exit()
print "您所在的网段为:%s" % (IP(input_IP).make_net(input_Netmask))