The interaction between Python and Redis

The interaction between Python and Redis one. Redis Module

Installation module:

PIP3 Install Redis

Connection mode:

R = Redis. Redis (host= ' localhost ', port=6379)

Connection pooling: To conserve resources, reduce the consumption of multiple connections.

Pool=redis. ConnectionPool (host= ' localhost ', port=6379,decode_responses=true)

Two. Redis Operations

General Operation:

import redisr = redis.Redis(host=‘localhost‘,port=6379)r.set(‘foo‘,‘bar‘)print(r.get(‘foo‘))

Connection pool:

import redispool = redis.ConnectionPool(host=‘localhost‘,port=6379,decode_responses=True)# 默认设置的值和取得的值都是bytes类型，如果想改为str类型，可以添加decode_responses=Truer1 = redis.Redis(connection_pool=pool)r2 = redis.Redis(connection_pool=pool)r1.set(‘name‘,‘jack‘)print(r1.get(‘name‘))r2.set(‘age‘,18)print(r2.get(‘age‘))print(r1.client_list())print(r2.client_list())

Pipeline:

import redis,timer = redis.Redis(host=‘localhost‘,port=6379,decode_responses=True)pipe = r.pipeline(transaction=True)pipe.set(‘name1‘,‘Alin‘)pipe.set(‘name2‘,‘Lnda‘)pipe.set(‘name3‘,‘Tony‘)time.sleep(5) pipe.execute()print(r.mget(‘name1‘,‘name2‘,‘name3‘))

Transactions: Python can use pipelines instead of transactions

import redis,timeimport redis.exceptionsr = redis.Redis(host=‘localhost‘,port=6379,decode_responses=True)pipe = r.pipeline()print(r.get(‘name1‘))try:    pipe.multi()    pipe.set(‘age1‘,22)    pipe.set(‘age2‘,23)    pipe.set(‘age3‘,24)    time.sleep(5)    pipe.execute()    print(r.mget(‘age1‘,‘age2‘,‘age3‘))except redis.exceptions.WatchError as e:    print(‘Error‘)

Subscribe and publish:
Publisher:

import redisr = redis.Redis(host=‘localhost‘,port=6379,decode_responses=True)while True:    msg = input(‘echo>>:‘)    if len(msg) == 0:        continue    elif msg == ‘quit‘:        r.publish(‘cctv1‘,msg)        break    else:        r.publish(‘cctv1‘,msg)

Subscribers:

import redisr = redis.Redis(host=‘localhost‘,port=6379,decode_responses=True)chan = r.pubsub() #返回一个发布订阅对象msg_reciver = chan.subscribe(‘cctv1‘) #订阅msg = chan.parse_response()  # 返回一个确认print(msg)print(‘订阅成功，开始接收...‘)while True:    msg = chan.parse_response()  #接收消息    if msg[2] == ‘quit‘:  #格式：类型，频道，消息        break    else:        print(‘>>:‘, msg[2])

The interaction between Python and Redis