In python, the Queue asyncio. Queue is used for detailed communication,

In python, the Queue asyncio. Queue is used for detailed communication,

Preface

This article mainly introduces the related content of asyncio. Queue communication in the python Queue for your reference. I will not talk about it much below. Let's take a look at the detailed introduction.

Asyncio. Queue is the same as other queues and is both FIFO and defined for coroutine.

Example:

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() 

The output is as follows:

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

Summary

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