前言
本文主要给大家介绍了关于python用队列asyncio.Queue通讯的相关内容,分享出来供大家参考学习,下面话不多说了,来一起看看详细的介绍吧。
asyncio.Queue与其它队列是一样的,都是先进先出,它是为协程定义的
例子如下:
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import asyncio
async def consumer(n, q):
print ( 'consumer {}: starting' . format (n))
while True :
print ( 'consumer {}: waiting for item' . format (n))
item = await q.get()
print ( 'consumer {}: has item {}' . format (n, item))
if item is None :
# None is the signal to stop.
q.task_done()
break
else :
await asyncio.sleep( 0.01 * item)
q.task_done()
print ( 'consumer {}: ending' . format (n))
async def producer(q, num_workers):
print ( 'producer: starting' )
# Add some numbers to the queue to simulate jobs
for i in range (num_workers * 3 ):
await q.put(i)
print ( 'producer: added task {} to the queue' . format (i))
# Add None entries in the queue
# to signal the consumers to exit
print ( 'producer: adding stop signals to the queue' )
for i in range (num_workers):
await q.put( None )
print ( 'producer: waiting for queue to empty' )
await q.join()
print ( 'producer: ending' )
async def main(loop, num_consumers):
# Create the queue with a fixed size so the producer
# will block until the consumers pull some items out.
q = asyncio.Queue(maxsize = num_consumers)
# Scheduled the consumer tasks.
consumers = [
loop.create_task(consumer(i, q))
for i in range (num_consumers)
]
# Schedule the producer task.
prod = loop.create_task(producer(q, num_consumers))
# Wait for all of the coroutines to finish.
await asyncio.wait(consumers + [prod])
event_loop = asyncio.get_event_loop()
try :
event_loop.run_until_complete(main(event_loop, 2 ))
finally :
event_loop.close()
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输出如下:
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consumer 0: starting
consumer 0: waiting for item
consumer 1: starting
consumer 1: waiting for item
producer: starting
producer: added task 0 to the queue
producer: added task 1 to the queue
consumer 0: has item 0
consumer 1: has item 1
producer: added task 2 to the queue
producer: added task 3 to the queue
consumer 0: waiting for item
consumer 0: has item 2
producer: added task 4 to the queue
consumer 1: waiting for item
consumer 1: has item 3
producer: added task 5 to the queue
producer: adding stop signals to the queue
consumer 0: waiting for item
consumer 0: has item 4
consumer 1: waiting for item
consumer 1: has item 5
producer: waiting for queue to empty
consumer 0: waiting for item
consumer 0: has item None
consumer 0: ending
consumer 1: waiting for item
consumer 1: has item None
consumer 1: ending
producer: ending
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总结
以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作具有一定的参考学习价值,如果有疑问大家可以留言交流,谢谢大家对服务器之家的支持。
原文链接:http://blog.csdn.net/caimouse/article/details/77916974