python 定时任务去检测服务器端口是否通的实例

import socketimport threadingimport time def testconn( host , port ):  sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  sk.settimeout(1)  try:    sk.connect((host,port))    return host+" Server is "+str(port)+" connect"  except Exception:    return host+" Server is "+str(port)+" not connect!"  sk.close() class Test(threading.Thread):  def __init__(self):    pass  def test(self):    print testconn('172.31.32.3',22)  def run(self):    while True:      #print time.strftime('%Y-%m-%d %H:%M:%S')      self.test()      time.sleep(1)a=Test()a.run()