import time
import threading
import queue

# 一個(gè)線程，間隔一定的時(shí)間，把一個(gè)遞增的數(shù)字寫入隊(duì)列
# 生產(chǎn)者
class Producer(threading.Thread):

??? def __init__(self, work_queue):
??????? super().__init__() # 必須調(diào)用
??????? self.work_queue = work_queue
???????
??? def run(self):
??????? num = 1
??????? while True:
??????????? self.work_queue.put(num)
??????????? num = num+1
??????????? time.sleep(1) # 暫停1秒

# 一個(gè)線程，從隊(duì)列取出數(shù)字，并顯示到終端
class Printer(threading.Thread):

??? def __init__(self, work_queue):
??????? super().__init__() # 必須調(diào)用
??????? self.work_queue = work_queue

??? def run(self):
??????? while True:
??????????? num = self.work_queue.get() # 當(dāng)隊(duì)列為空時(shí)，會(huì)阻塞，直到有數(shù)據(jù)
??????????? print(num)

def main():
??? work_queue = queue.Queue()

??? producer = Producer(work_queue)
??? producer.daemon = True # 當(dāng)主線程退出時(shí)子線程也退出
??? producer.start()

??? printer = Printer(work_queue)
??? printer.daemon = True # 當(dāng)主線程退出時(shí)子線程也退出
??? printer.start()

??? work_queue.join() # 主線程會(huì)停在這里，直到所有數(shù)字被get()，并且task_done()，因?yàn)闆]有調(diào)用task_done()，所在這里會(huì)一直阻塞，直到用戶按^C

if __name__ == '__main__':
??? main()