What are some examples of using multiprocessing queues in Python?

What are some examples of using multiprocessing queues in Python?

Multiprocessing queues in Python allow you to share data between processes. For example, you can use a queue to send tasks from a main process to worker processes.

Can you show me a simple code example?

Sure! Here's a basic example:

from multiprocessing import Process, Queue

def worker(q):
    while not q.empty():
        item = q.get()
        print(f'Processing {item}')

if __name__ == '__main__':
    q = Queue()
    for item in range(5):
        q.put(item)
    processes = [Process(target=worker, args=(q,)) for _ in range(2)]
    for p in processes:
        p.start()
    for p in processes:
        p.join()

What happens if the queue is empty?

If the queue is empty, the get() method will block until an item is available unless you set the block parameter to False.

Are there any limitations to using multiprocessing queues?

Yes, some limitations include the overhead of inter-process communication and the fact that only picklable objects can be put into a queue.