# -*- coding: cp936 -*-

 import threading  # Python主要通过标准库中的threading包来实现多线程

 import time

 import os

 def doChore():      #作为间隔  每次调用间隔0.5s

     time.sleep(0.5)

 def booth(tid):

     global i

     global lock

     while True:

         lock.acquire()                # 得到一个锁，锁定

         if i != 0:

             i = i - 1                 # 售票 售出一张减少一张

             print(tid,':now left:',i) # 剩下的票数

             doChore()

         else:

             print("Thread_id",tid," No more tickets")

             os._exit(0)              # 票售完   退出程序

         lock.release()               # 释放锁

         doChore()                    

 # Start of the main function

 i= 15                           # 初始化票数

 lock = threading.Lock()         # 创建锁           

 # 总共设置了10个线程

 for k in range(10):

     new_thread = threading.Thread(target=booth,args=(k,))   # 创建线程; Python使用threading.Thread对象来代表线程

     new_thread.start()                                      # 调用start()方法启动线程