python接入阿里云实现发布订阅

要实现Python接入阿里云的发布订阅功能，你需要先进行以下几个步骤：

1. 创建阿里云账号并开通消息服务。

2. 安装aliyun-python-sdk-core和aliyun-python-sdk-mns模块。

3. 获取阿里云账号的AccessKey ID和AccessKey Secret，并创建MNS客户端。

4. 创建主题和订阅。

下面是Python代码示例：

from aliyunsdkcore.client import AcsClient
from aliyunsdkcore.auth.credentials import AccessKeyCredential
from aliyunsdkmns.request.v20150629 import *
from aliyunsdkmns.request.v20150629.PublishMessageRequest import *
from aliyunsdkmns.request.v20150629.SubscribeRequest import *

# 阿里云账号的AccessKey ID和AccessKey Secret
access_key_id = 'your_access_key_id'
access_key_secret = 'your_access_key_secret'

# 创建MNS客户端
cred = AccessKeyCredential(access_key_id, access_key_secret)
client = AcsClient("", "", "cn-hangzhou", credential=cred)

# 创建主题和订阅
topic_name = 'test_topic'
subscription_name = 'test_subscription'
request = CreateTopicRequest.CreateTopicRequest()
request.set_topic_name(topic_name)
client.do_action_with_exception(request)

request = SubscribeRequest.SubscribeRequest()
request.set_topic_name(topic_name)
request.set_subscription_name(subscription_name)
request.set_notify_content_format('JSON')
request.set_endpoint('your_endpoint')
client.do_action_with_exception(request)

# 发布消息
message = 'Hello, World!'
request = PublishMessageRequest.PublishMessageRequest()
request.set_topic_name(topic_name)
request.set_message_body(message)
client.do_action_with_exception(request)

# 接收消息
request = ReceiveMessageRequest.ReceiveMessageRequest()
request.set_subscription_name(subscription_name)
response = client.do_action_with_exception(request)
messages = response.decode('utf-8')
print(messages)

其中，access_key_id和access_key_secret需要替换为你自己的阿里云账号的AccessKey ID和AccessKey Secret，topic_name和subscription_name可以根据自己的需求自定义，endpoint需要替换为你自己的接收消息的URL。