python实现扫描指定端口

#!/usr/bin/env python
# encoding: utf-8

import socket,sys
ip = '172.16.138.238'
port = [23,80,8080,123,465,789,323,3306,3389,139,138]
def portScan(ip,port):
    s = socket.socket()
    s.settimeout(1)
    try:
        s.connect((ip,port))
        s.close()
        return True
    except:
        return False

def scan(ip,port):
    for x in port:
        r = portScan(ip,x)
        if r:
            sys.stderr.write('%s:%s is open\n' % (ip,x))
        else:
            print ('%s:%s is close' % (ip,x))

scan(ip,port)