python rabbitmq 队列持久

import pika

connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
channel = connection.channel()


channel.queue_declare(queue='hello',durable=True)  ##队列持久化，队列重启后也存在，不保证数据是否存在
# channel.queue_delete(queue="task_queue")
# for i in range(100):
channel.basic_publish(exchange='',
                      routing_key='hello',
                      body="hello world",
                      properties=pika.BasicProperties(delivery_mode=2) ##数据持久化
                      )
# print("Sent 'hello world!'")
connection.close()

import pika
import time
connection = pika.BlockingConnection(pika.ConnectionParameters(host='localhost'))
channel = connection.channel()

channel.queue_declare(queue='hello',durable=True)
# channel.queue_bind(queue='hello',exchange='',routing_key='hello')
def callback(ch, method, properties, body):
    print("aaa")
    # time.sleep(8)
    print(" [x] Received %r" % body)
    ch.basic_ack(delivery_tag=method.delivery_tag)  # 给rabbitmq返回已拿到数据信号。


channel.basic_consume(callback,
                      queue='hello',
                      no_ack=False)

print(' [*] Waiting for messages. To exit press CTRL+C')
channel.start_consuming()