Python flera trådar med return värde

import time
import threading
from queue import Queue


def def_test(queue):
    time.sleep(0.5)
    a = 1
    queue.put(a)


if __name__ == '__main__':
    threads = []
    queue = Queue()

    for _ in range(5):
        time.sleep(0.2)
        tread = threading.Thread(target=def_test, args=(queue,))
        threads.append(tread)
        tread.start()

    for thread in threads:
        thread.join()

    x = sum(queue.queue)
    print(x)

import time
from concurrent.futures import ThreadPoolExecutor


def def_test():
    time.sleep(0.5)
    a = 1
    return a


if __name__ == '__main__':
    threads = []
    number_of_threads = 5
    x = 0

    with ThreadPoolExecutor(max_workers=number_of_threads) as executor:
        for feature in [executor.submit(def_test) for _ in range(number_of_threads)]:
            x += feature.result()
    print(x)