队列实现生产者与消费者

import threading,time,queue,random

def scz():
 while True:
 num=random.randint(1,100000)
 q.put(num)#放进队列
print("生产者产生了%d数据" %(num))
 time.sleep(5)
 q.task_done()#完成任务

def xfz():
 while True:
 item=q.get()#从队列取出
if item is None:
 break
 print("消费者消费了%d数据"%item)
 time.sleep(3)
 q.task_done()


if __name__ == '__main__':
 
 q=queue.Queue()


 for i in range(4):
 threading.Thread(target=scz).start()

 for i in range(3):
 threading.Thread(target=xfz).start()