python多任務編程-線程池-通過回調函數獲取返回值

示例代碼如下：

import threading
import time
from concurrent.futures import ThreadPoolExecutor


def make_food(food):
    print(food, "開始制作")
    time.sleep(2)
    print(food, "制作完成")
    return food


def get_finish_food(future):
    print(future.result())
    return future.result()


def main():

    food_list = ['番茄炒雞蛋', '青椒炒牛肉']
	
    # 創建2個線程
    pool = ThreadPoolExecutor(max_workers=2)

    for food in food_list:
        future = pool.submit(make_food, food)
        # 不阻塞，通過回調函數，獲取函數返回值
        future.add_done_callback(get_finish_food)


if __name__ == '__main__':
    main()