什么是 python rabbitmq

import pika
import json
import time
 
credentials = pika.PlainCredentials('admin', 'admin')  # mq用户名和密码
# 虚拟队列需要指定参数 virtual_host，如果是默认的可以不填。
connection = pika.BlockingConnection(pika.ConnectionParameters(host='127.0.0.1', port=5672, credentials=credentials))
channel = connection.channel()
# 声明消息队列，消息将在这个队列传递，如不存在，则创建
queue_name = "delay_queue_a"
exchange = 'delay_exchange_a'
routing_key = 'delay_routing_key_a'
dead_letter_exchange = 'dead_exchange_a'  # 'amq.direct'#'dead_exchange_a'
dead_letter_routing_key = 'dead_letter_routing_key_a'  # 'dead_queue_a'#'dead_letter_routing_key_a'
arguments = {
    "x-message-ttl": 5000,
    'x-dead-letter-exchange': dead_letter_exchange,
    'x-dead-letter-routing-key': dead_letter_routing_key
}
 
channel.confirm_delivery()
 
channel.exchange_declare(exchange=exchange, durable=True, exchange_type='direct')
result = channel.queue_declare(queue=queue_name, durable=False, arguments=arguments)
channel.queue_bind(exchange=exchange, queue=queue_name, routing_key=routing_key)
for i in range(10):
    message = json.dumps({'OrderId': i})
    # 向队列插入数值 routing_key是队列名
    channel.basic_publish(exchange=exchange, routing_key=routing_key, body=message,
                          properties=pika.BasicProperties(delivery_mode=2))
    print(message)
    time.sleep(1.5)
 
connection.close()