#!/usr/bin/env python# -*- coding: utf-8 -*-import timefrom threading import Thread, Eventimport randomitems = []event = Event()class Consumer(Thread):    def __init__(self, items, event):        Thread.__init__(self)        self.items = items        self.event = event    def run(self):        while True:            time.sleep(2)            self.event.wait()            item = self.items.pop()            print("Consumer notify: %d poped from list by %s"                  %(item, self.name))class Producer(Thread):    def __init__(self, items, event):        Thread.__init__(self)        self.items = items        self.event = event    def run(self):        global item        for i in range(10):            time.sleep(2)            item = random.randint(0, 256)            self.items.append(item)            print ("Producer nofity: item N %d appended to list by %s"                   % (item, self.name))            print ("Producer notify: event set by %s "                   % self.name)            self.event.set()            print("Produce notify: event clear by %s\n"                  % self.name)            self.event.clear()if __name__ == "__main__":    producer = Producer(items, event)    consumer = Consumer(items, event)    producer.start()    consumer.start()    producer.join()    consumer.join()