python多线程问题，模拟抢退票过程

痛定思痛。 2022-05-12 02:50 128阅读 0赞

import time
    import threading
    import random
    
    tickets=500
    condition=threading.Condition()
    
    class buy(threading.Thread):
        def __init__(self,threadname):
            threading.Thread.__init__(self)
            self.__threadname=threadname
        def run(self):
            global tickets
            while True:
                if condition.acquire():
                    if tickets<=0:
                        print("暂无余票，请等待")
                        condition.wait()
                    else:
                        tickets-=1
                        msg=time.ctime()+" "+self.__threadname+"购买1张票，余票{}张".format(tickets)
                        print(msg)
                        condition.notify()
                    condition.release()
                    time.sleep(random.randrange(10))
    
    class sell(threading.Thread):
        def __init__(self,threadname):
            threading.Thread.__init__(self)
            self.__threadname=threadname
        def run(self):
            global tickets
            while True:
                if condition.acquire():
                    if tickets>=500:
                        print("无法退票")
                        condition.wait()
                    else:
                        tickets+=1
                        msg=time.ctime()+" "+self.__threadname+"退票1张，余票{}张".format(tickets)
                        print(msg)
                        condition.notify()
                    condition.release()
                    time.sleep(random.randrange(10)/5)
    
    if __name__ == '__main__':
        for i in range(200):
            s=sell('[用户'+str(i+1)+"]")
            s.start()
        for i in range(500):
            b=buy('[用户'+str(i+1)+"]")
            b.start()

效果图：  
![这里写图片描述][70]

[70]: /images/20220512/342c210be0334c77bdbcd3ebbd4d3b1d.png