python判断端口是否打开的代码

#!/usr/bin/env python
# name IsOpen.py

import os
import socket

def IsOpen(ip,port):
    s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
    try:
        s.connect((ip,int(port)))
        s.shutdown(2)
        print '%d is open' % port
        return True
    except:
        print '%d is down' % port
        return False

if __name__ == '__main__':
    IsOpen('1.1.1.1',800)