import concurrent.futures

import time

import random

​

​

class SomeStorage:

    def __init__(self):

        self.value = 0

​

    def update(self):

        local_copy = self.value

        local_copy += 1

        time.sleep(random.uniform(0.1, 2))

        self.value = local_copy

​

​

if __name__ == "__main__":

    database = SomeStorage()

    print('init ', database.value)

​

    with concurrent.futures.ThreadPoolExecutor(max_workers=1) as executor:

        for index in range(20):

            executor.submit(database.update)

​

    time.sleep(1)

​

    print("result ", database.value)