Multiprocessing passing values back

mp.py

import multiprocessing as mp


def process(arguments, res_q):
    (i,) = arguments
    res_q.put([i])


max_processes = 2
queue = mp.Queue()
res_q = mp.Queue()  # result queue

for idx in [1, 2, 3]:
    queue.put([idx])
    if len(mp.active_children()) < max_processes:
        p = mp.Process(target=process, args=(queue.get(), res_q))
        p.start()

# Checking if some items in the queue are unprocessed
while not queue.empty():
    if len(mp.active_children()) < max_processes:
        p = mp.Process(target=process, args=(queue.get(), res_q))
        p.start()
p.join()

# Save results
while not res_q.empty():
    item = res_q.get()
    print(item)