我有一个dict x，格式如下：x_dic = {0：{'length'：2，'current'：0}}，但是当我使用Manager（）。dict（）将x_dic传递给子进程时，我发现子进程无法更新“当前”中的值。

method 1: 
dic[i]['current'] += 1

method 2:
current_val = dic[i]['current']
current_val += 1
dic[i]['current'] = current_val

if __name__ == '__main__':
    # set config of logger
    print("{}:{}:{}".format(time.localtime().tm_hour,time.localtime().tm_min,time.localtime().tm_sec))
    print(os.getpid())

    # set parameter
    lock = multiprocessing.Lock()
    pool = multiprocessing.Pool(processes=2,initializer=start_process)

    # set test dic 
    testdic = multiprocessing.Manager().dict()
    x = {0:{'length':2,'current':0}}
    testdic.update(x)

    # before multi
    print('now value testdic',dict(testdic))

    # running
    partialmulti = partial(multi_core,testdic=testdic)
    for i,_ in enumerate(pool.imap_unordered(partialmulti,[0,0])):
        print('finish process: ',i)

    pool.close()
    pool.join()

    # after multiprocessing
    print('after multi',dict(testdic))

    pool.terminate()