queue

import threading

import time

from queue import Queue

def job(l, q):

for i in range(len(l)):

l[i] = l[i] ** 2

q.put(l)

def multithreading():

q = Queue()

threads = []

data = [[1, 2, 3], [3, 4, 5], [4, 4, 4], [5, 5, 5]]

for i in range(4):

t = threading.Thread(target=job, args=(data[i], q))

t.start()

threads.append(t)

for thread in threads:

thread.join()

results = []

for _ in range(4):

results.append(q.get())

return results

if __name__ == '__main__':

results = multithreading()

print(results)