How can I use a queue in Python's multiprocessing module?

How can I use a queue in Python's multiprocessing module?

You can use the Queue class from the multiprocessing module to share data between processes. It allows you to add and retrieve items in a thread-safe manner.

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 an item from an empty queue?

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

Are there any limitations to using queues?

Yes, queues can introduce overhead due to inter-process communication, and they may not be suitable for very high-frequency data exchange.