如何从python将字典存储在redis中

Question

我正试图通过redis在内存中存储一个python dict，我正在遵循pypi文档，当我尝试实例化RedisCluster时，我得到了这个错误：

from redis.cluster import RedisCluster as Redis # this line works
rc = Redis(host='localhost', port=6379) # here is the problem
Traceback (most recent call last):
File "/home/developer/.pyenv/versions/redisTesting/lib/python3.9/site-packages/redis/cluster.py", line 1306, in initialize
raise RedisClusterException(
redis.exceptions.RedisClusterException: Cluster mode is not enabled on this node
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/developer/.pyenv/versions/3.9.5/lib/python3.9/code.py", line 90, in runcode
exec(code, self.locals)
File "<input>", line 1, in <module>
File "/home/developer/.pyenv/versions/redisTesting/lib/python3.9/site-packages/redis/cluster.py", line 507, in __init__
self.nodes_manager = NodesManager(
File "/home/developer/.pyenv/versions/redisTesting/lib/python3.9/site-packages/redis/cluster.py", line 1128, in __init__
self.initialize()
File "/home/developer/.pyenv/versions/redisTesting/lib/python3.9/site-packages/redis/cluster.py", line 1334, in initialize
raise RedisClusterException(
redis.exceptions.RedisClusterException: ERROR sending "cluster slots" command to redis server 127.0.0.1:6379. error: Cluster mode is not enabled on this node

我知道问题是Cluster mode is not enabled on this node，但我没有找到解决这个错误的方法，如何在节点上启用集群模式？

此外，我找到了一种方法，用将这个dict存储在内存中

import redis
r = redis.Redis()
r.hmset({
"color": "green",
"price": 99.99,
"style": "baseball",
"quantity": 200,
"npurchased": 0,
})

但这给了我一个不推荐的警告<input>:1: DeprecationWarning: Redis.hmset() is deprecated. Use Redis.hset() instead.，当我试图使用r.hset((时，终端给了我redis.exceptions.DataError: Invalid input of type: 'dict'. Convert to a bytes, string, int or float first.

Answer 1

将redis.cluster更改为redis，连接将成功。

#from redis.cluster import RedisCluster as Redis # this line works (but assumes you are connecting to Redis Cluster)
from redis import Redis
rc = Redis(host='localhost', port=6379) 

Answer 2

如前所述，hmset已弃用。相反，您应该使用hset，它可以使用mapping参数接收字典作为输入(只要它没有嵌套(。

另一个观察结果是，在调用hset时缺少映射键名称。所以这应该有效：

r.hmset("you_key_name", {
"color": "green",
"price": 99.99,
"style": "baseball",
"quantity": 200,
"npurchased": 0,
})

如果您需要嵌套功能，那么添加json转储，如下所示：

r.hmset("you_key_name", {
"color": "green",
"price_json": json.dumps({"val":99.99, "currency": "$"})
"style": "baseball",
"quantity": 200,
"npurchased": 0,
})