python多线程/队列如何用于脚本下载并将映像安装到所有设备

Question

我是python，多线程，队列和锁定的新手。我想要实现的是一次登录多个设备，检查新映像，下载映像，然后将其安装在所有设备上，在多线程进程中，必须在开始安装之前完成下载。我尝试了以下概念，但我不知道如何完成或连接/粘合它们，任何帮助将提前感激！

  from threading import Thread
  import Queue
  import re
  from LoginCli import Device_Under_test
  import sys, os, string, threading
  import time

  # some global vars
  num_threads = 25
  ips_q = Queue.Queue()
  out_q = Queue.Queue()
  outlock = threading.Lock()

  # build IP array
  ips = []
  for i in range(100,200):
    ips.append("10.10.10."+str(i))

  user = 'root'
  pword = 'password'  
  log = 'output.log'

  def login_to_device (i, q):
   """get hosts in queue"""
      while True:
        # get an IP item form queue
        ip = q.get()

        cmd = "check for image"

        #login to device:this works just fine using my loginCli script
        LoginCli = Device_Under_test(str(ip), user, pword)
        print_cmd= LoginCli.send_exp(cmd)

      with outlock:
         print print_cmd

      q.task_done()

   def image_download (i, q):
     while True:
        #get an IP item form queue
        ip = q.get()
        cmd = "download for image"

        #NOT sure if I need to login again!
        LoginCli = Device_Under_test(str(ip), user, pword)
        print_cmd= LoginCli.send_exp(cmd)
        search = re.search(r'image download completed 100%', LoginCli)

        #if is done 100% completed then start installing the image 
        #Once installing is completed then reboot all devices 
      with outlock:
         print print_cmd      
      q.task_done()


    # Not sure if I need these functions?
    def image_downoad (i, q):

    def image_install (i, q):

     # start the thread pool
    for i in range(num_threads):
      worker = Thread(target=login_to_device, args=(i, ips_q))
      worker.setDaemon(True)
      worker.start()

    for i in range(num_threads):
      worker = Thread(target=image_downoad, args=(i, ips_q))
      worker.setDaemon(True)
      worker.start()

     # fill queue
    for ip in ips:
      ips_q.put(ip)

     # wait until worker threads are done to exit    
    ips_q.join()

    # print result
    while True:
      try:
        msg = out_q.get_nowait()
      except Queue.Empty:
        break
    print msg