1.Python操作Redis：键(Key)

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Python的redis模块管理键（Key）方法主要实现的Redis命令包括KEYS、GET、DEL（delete）、EXISTS、RANDOMKEY，TYPE、EXPIRE,其他的一些不能实现的在代码注释里面有所体现。

实验环境

Linux系统版本LSB Version:    :base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarchDistributor ID: RedHatEnterpriseServerDescription:    Red Hat Enterprise Linux Server release 6.4 (Santiago)Release:    6.4Codename:   SantiagoRedis版本127.0.0.1:6379> info# Serverredis_version:3.0.7Python版本Python 2.6.6 (r266:84292, Jul 23 2015, 15:22:56) [GCC 4.4.7 20120313 (Red Hat 4.4.7-11)] on linux2Type "help", "copyright", "credits" or "license" for more information.Python的Redis模块版本DATA    __all__ = ['Redis', 'ConnectionPool', 'RedisError', 'ConnectionError',...    __version__ = '2.0.0'VERSION    2.0.0

函数说明

set/get : 设置或者获取指定key的值，set/get key value
delete : 函数实现redis数据库DEL命令功能，delete key/DEL key
exists : 检测key存在与否，返回1或者0, exists key_name
expire : 设置过期时间，以秒计，expire key time
keys : 查找所有符合给定模式( pattern)的键 , keys pattern
type : 返回键(Key)对应的值, type key
randomKey : 返回当前数据库随机键对应的值，randomkey()/RANDOMKEY
由于Python的redis模块原因，Redis客户端有关键（KEY）的命令目前暂无可实现方法的代码事例。

代码示例

#!/usr/bin/pythonimport redisimport time## Connect local redis serviceclient =redis.Redis(host='127.0.0.1',port=6379,db=0)print "Connection to server successfully!"dicKeys = client.keys("*")print dicKeys### Redis Key command part Start #### Set key-vlaue and get key-valueclient.set('w3ckey','redis')val = client.get('w3ckey')print "Get key-vlaue ", val# Delete key w3ckeyclient.delete('w3ckey')val = client.get('w3ckey')print "Get none key-vlaue: ", val# No dump key-valueclient.set('greeting','Hello, dumping world!')val = client.get('greeting')print "Get key-vlaue ", val# Exists checkkeyList = ['w3ckey','greeting']for key in keyList:#    print "Key name: ",key    isKey =client.exists(key)    if isKey :        print "Have value mapping with key: ", key    else:        print "No value mapping with key: ",key# Set Expire time for greetingclient.expire('greeting',2)#saveTime = client.pttl('greeting')#print "Remaining time: ",saveTimetime.sleep(2)isExpire = client.get('greeting')if not isExpire:    print "Key expire "else:     print "Key not expire"# Key get special pattern, Redis command:keys#set valuekeyDic = {'w3c1':'redis', 'w3c2':'mysql', 'w3c3':'mongodb'}for key in keyDic.keys():    client.set(key,keyDic[key])keyList = client.keys("w3c*")print "Get keys: ",keyList# Get random key from DB, Redis command:randomkeyrandomKey =client.randomkey()print "Get random key: ",randomKey# Get key type, Redis command:typekeyType =client.type(randomKey)print "Get key type: ",keyType# Push value to list's headclient.lpush('w3ckey','redis')client.lpush('w3ckey','mongodb')client.lpush('w3ckey','mysql')val = client.lrange('w3ckey',0,3)print "Get key-vlaue list: ", val#Empty dbclient.flushdb()hashVal = client.hgetall('profile')print hashVal

参考资料
1、Redis 键(key)
2、Python redis文档（python交互模式下命令>>>help redis）

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