如何在Python中编写发布者和订阅者向订阅者发送多行内容的代码？

pip install pika

import pika

# 发布者
def publisher():
    # 连接到RabbitMQ服务器
    connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
    channel = connection.channel()

    # 声明一个名为"message_queue"的队列
    channel.queue_declare(queue='message_queue')

    # 发送多行内容
    messages = [
        'Hello',
        'World',
        'This is a test'
    ]
    for message in messages:
        # 将消息发送到队列
        channel.basic_publish(exchange='', routing_key='message_queue', body=message)

    # 关闭连接
    connection.close()

# 订阅者
def subscriber():
    # 连接到RabbitMQ服务器
    connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
    channel = connection.channel()

    # 声明一个名为"message_queue"的队列
    channel.queue_declare(queue='message_queue')

    # 定义回调函数来处理接收到的消息
    def callback(ch, method, properties, body):
        print("Received message:", body)

    # 告诉RabbitMQ使用callback来接收消息
    channel.basic_consume(queue='message_queue', on_message_callback=callback, auto_ack=True)

    # 开始接收消息，并进入阻塞状态，等待消息到达
    channel.start_consuming()

# 启动发布者和订阅者
publisher()
subscriber()