How to use Redis in Python? The following article will introduce to you how to use Redis in Python. I hope it will be helpful to you!
Previously we used Redis client to use Redis, but in actual work, in most cases The following are all using Redis through code. Since the editor is familiar with Python, we will learn how to use Python today. ##Redis. [Related recommendations: Redis video tutorial]
Environment preparation
Redis First you need to install it.
Python is installed (Python3 is recommended). The Python
library of
Redis is installed (pip install redis).
Start practicingTry it outExample: We plan to connect to
Redis through Python. Then write a kv, and finally print out the queried v.
is the last one in the connection pool command to execute.
Connection pool
Normally, when you need to connect to
redis
, a connection will be created, and redis operations will be performed based on this connection. Release after the operation is completed. Under normal circumstances, this is no problem, but when the amount of concurrency is high, frequent connection creation and release will have a high impact on performance, so the connection pool comes into play. The principle of connection pool: Create multiple connections in advance. When performing
redis
operations, directly obtain the already created connections for operation. After completion, the connection will not be released, but returned to the connection pool for subsequent redis operations! This avoids continuous creation and release, thus improving performance! <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>#!/usr/bin/python3
import redis,time # 导入redis模块，通过python操作redis 也可以直接在redis主机的服务端操作缓存数据库
pool = redis.ConnectionPool(host=&#39;localhost&#39;, port=6379, password="pwd@321", decode_responses=True) # host是redis主机，需要redis服务端和客户端都起着 redis默认端口是6379
r = redis.Redis(connection_pool=pool)
r.set(&#39;name&#39;, &#39;phyger-from-python-redis&#39;)
print(r[&#39;name&#39;])
print(r.get(&#39;name&#39;)) # 取出键name对应的值
print(type(r.get(&#39;name&#39;)))</pre><div class="contentsignin">Copy after login</div></div>
You will find that in actual use, the effect of direct connection and using connection pool is the same, but there will be an obvious difference when concurrency is high. .
Basic Operation Practice
For the many
Redis
commands, we take the SET command as an example to demonstrate.
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