python里使用队列asyncio.Queue进行通讯

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 asyncioasync 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: 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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