接上文，介绍下类包装线程对象方式使用线程

python通过两个标准库thread和threading提供对线程的支持。thread提供了低级别的、原始的线程以及一个简单的锁。

样例会使用Threading模块创建线程，涉及到线程启动和运行

run(): 用以表示线程活动的方法。
start():启动线程活动。

我们的QThread类会从threading.Thread继承，然后重写init方法和run方法。

示例代码如下

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#!/usr/bin/python

import threading
import time

exitFlag = 0

class QThread(threading.Thread):#

  """QThread class"""

  def __init__(self, threadID, name, counter):
      threading.Thread.__init__(self)
      self.__threadID = threadID
      self.__name = name
      self.__counter = counter


  def run(self):#线程在创建后会直接运行run函数 
      print "%s start" % (self.__name)
      showMessage(self.__name, self.__counter, 6)
      print "Exit from" + self.__name
  
  
#定义函数
def showMessage(threadName, delayTime, counter):

      while counter:

          if exitFlag:
              thread.exit()

          time.sleep(delayTime)
          print "%s : %s" % (threadName, time.ctime(time.time()) )
          counter -= 1

#创建线程
t1 = QThread(1,"ksnow", 2)
t2 = QThread(2,"kair", 3)
t3 = QThread(3,"baby", 3)

#开启线程
t1.start()
t2.start()
t3.start()

print "exit from Main Thread"

运行结果如下：

ksnowlv@ksnowlvdeMacBook-Pro~/Documents/lvwei projects/python$python python_threading.py 
ksnow start
kair start
baby start
exit from Main Thread
ksnow : Thu Aug  7 22:41:42 2014
kair : Thu Aug  7 22:41:43 2014
baby : Thu Aug  7 22:41:43 2014
ksnow : Thu Aug  7 22:41:44 2014
kair : Thu Aug  7 22:41:46 2014
baby : Thu Aug  7 22:41:46 2014
ksnow : Thu Aug  7 22:41:46 2014
ksnow : Thu Aug  7 22:41:48 2014
kair : Thu Aug  7 22:41:49 2014
baby : Thu Aug  7 22:41:49 2014
ksnow : Thu Aug  7 22:41:50 2014
kair : Thu Aug  7 22:41:52 2014
baby : Thu Aug  7 22:41:52 2014
ksnow : Thu Aug  7 22:41:52 2014
Exit fromksnow
baby : Thu Aug  7 22:41:55 2014
 kair : Thu Aug  7 22:41:55 2014
baby : Thu Aug  7 22:41:58 2014
 Exit frombaby
kair : Thu Aug  7 22:41:58 2014
Exit fromkair