Python Beginner's way: Python Basics-Operation Cache Memcache, Redis

First, build memcached and Redis

Go to Baidu yourself.

Second, Operation Mmecached

1. Install the API

python-m pip Install python-memcached

2. Start memcached

memcached-d-u root-p 12000-m-d-u root-p 12001-m 50-d-u root-p 12002-m
参数说明:

     - d 是启动一个守护进程      - m 是分配给Memcache使用的内存数量，单位是MB      - u 是运行Memcache的用户      - l 是监听的服务器IP地址      - p 是设置Memcache监听的端口,最好是 1024 以上的端口      - c 选项是最大运行的并发连接数，默认是 1024 ，按照你服务器的负载量来设定      - P 是设置保存Memcache的pid文件

3. Python memcached module support for memcached clusters

The python-memcached module natively supports cluster operations by maintaining a list of hosts in memory, and the weight values of the hosts in the cluster are proportional to the number of occurrences of the host in the list.

1234567

主机    权重    1.1.1.11    1.1.1.2 2    1.1.1.31那么在内存中主机列表为：    host_list =["1.1.1.1", "1.1.1.2", "1.1.1.2", "1.1.1.3", ]

If the user is to create a key-value pair in memory (for example: K1 = "V1"), then perform the steps:

• Convert K1 into a number based on the algorithm
• Calculate number and host list length to remainder, get a value n (0 <= N < list length)
• Gets the host in the host list according to the value obtained in 2nd step, for example: Host_list[n]
• Connect the host acquired in step 3rd, place k1 = "V1" In the server's memory

The code is implemented as follows:

123	mc =memcache.Client([(‘1.1.1.1:12000‘, 1), (‘1.1.1.2:12000‘, 2), (‘1.1.1.3:12000‘, 1)], debug=True)mc.set(‘k1‘, ‘v1‘)

4. Add (KeyName, value)

Obj.add (' K1 ', ' v1 ') obj.add (' K1 ', ' v1 ') v1 = obj.get (' K1 ') print (' v1: ', v1) out:MemCached:while expecting ' STORED ', got une xpected response ' not_stored ' # If the added key exists, then the error v1:  v1

　　

5. Replace (KeyName, New_value)

Obj.replace (' K1 ', ' new_v1 ') v1 = obj.get (' K1 ') print (' v1: ', v1) out:v1:  new_v1

6. Set and Set_multi

Set sets a key-value pair, if key does not exist, is created if key exists, then modifies

Get gets a key value pair

Set_multi set multiple key-value pairs, if key does not exist, create if key exists, modify

Get_multi getting multiple key-value pairs

# Set and get
Obj.set (' K1 ', ' modify_v1 ') obj.set (' K2 ', ' newadd_v2 ') v1 = obj.get (' K1 ') print (' v1: ', v1) v2 = obj.get (' K2 ') print (' V2: '), V2) Out:v1:  modify_v1v2:  newadd_v2

# Set_multi and Get_multiobj.set_multi ({' K3 ': ' V3 ', ' K4 ': ' v4 '}) print (Obj.get_multi ([' K3 ', ' K4 ')]) out:{' K3 ': ' V3 ', ' K4 ': ' V4 '}

　　

7. Delete and Delete_multi

9. Append and Prepend

DECR and INCR.

One. Gets and CAs

Python Beginner's way: Python Basics-Operation Cache Memcache, Redis