子进程如何更新父进程中的变量？

from multiprocessing import Process, Queue

def child_process(queue):
    # 更新变量
    queue.put(new_value)

if __name__ == '__main__':
    queue = Queue()
    p = Process(target=child_process, args=(queue,))
    p.start()
    
    # 从队列中获取更新后的变量
    new_variable = queue.get()
    
    # 更新父进程中的变量
    parent_variable = new_variable

from multiprocessing import Process, Pipe

def child_process(conn):
    # 更新变量
    conn.send(new_value)

if __name__ == '__main__':
    parent_conn, child_conn = Pipe()
    p = Process(target=child_process, args=(child_conn,))
    p.start()
    
    # 从管道中接收更新后的变量
    new_variable = parent_conn.recv()
    
    # 更新父进程中的变量
    parent_variable = new_variable

from multiprocessing import Process, Value

def child_process(shared_variable):
    # 更新变量
    shared_variable.value = new_value

if __name__ == '__main__':
    shared_variable = Value('i', 0)
    p = Process(target=child_process, args=(shared_variable,))
    p.start()
    
    # 从共享内存中获取更新后的变量
    new_variable = shared_variable.value
    
    # 更新父进程中的变量
    parent_variable = new_variable