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：

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()

输出如下：

consumer 0: startingconsumer 0: waiting for itemconsumer 1: startingconsumer 1: waiting for itemproducer: startingproducer: added task 0 to the queueproducer: added task 1 to the queueconsumer 0: has item 0consumer 1: has item 1producer: added task 2 to the queueproducer: added task 3 to the queueconsumer 0: waiting for itemconsumer 0: has item 2producer: added task 4 to the queueconsumer 1: waiting for itemconsumer 1: has item 3producer: added task 5 to the queueproducer: adding stop signals to the queueconsumer 0: waiting for itemconsumer 0: has item 4consumer 1: waiting for itemconsumer 1: has item 5producer: waiting for queue to emptyconsumer 0: waiting for itemconsumer 0: has item Noneconsumer 0: endingconsumer 1: waiting for itemconsumer 1: has item Noneconsumer 1: endingproducer: ending

总结

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