import os, re, threading class ip_check(threading.Thread):      def __init__ (self,ip):             threading.Thread.__init__(self)             self.ip = ip             self.__successful_pings = -1      def run(self):             ping_out = os.popen("ping -q -c2 "+self.ip,"r")             while True:                 line = ping_out.readline()                 if not line: break                 n_received = re.findall(received_packages,line)                 if n_received:                      self.__successful_pings = int(n_received[0])      def status(self):             if self.__successful_pings == 0:                  return "no response"             elif self.__successful_pings == 1:                  return "alive, but 50 % package loss"             elif self.__successful_pings == 2:                  return "alive"             else:                  return "shouldn't occur" received_packages = re.compile(r"(\d) received") check_results = [] for suffix in range(20,70):      ip = "192.168.178."+str(suffix)      current = ip_check(ip)      check_results.append(current)      current.start() for el in check_results:      el.join()      print "Status from ", el.ip,"is",el.status()