How can I use queues in Python's multiprocessing module?

How can I use queues in Python's multiprocessing module?

You can use the Queue class from the multiprocessing module to share data between processes. It allows you to create a FIFO queue.

Can you show me a simple example of using a queue?

Sure! Here's a basic example:

from multiprocessing import Process, Queue

def worker(q):
    q.put('Hello from the worker!')

if __name__ == '__main__':
    q = Queue()
    p = Process(target=worker, args=(q,))
    p.start()
    print(q.get())  # Output: Hello from the worker!
    p.join()

What happens if I try to get from an empty queue?

If you try to get from an empty queue, it will block until an item is available. You can use get_nowait() to avoid blocking.

Are there any limitations I should be aware of when using queues?

Yes, queues can have performance limitations due to locking mechanisms. It's also important to manage the size of the queue to avoid memory issues.