python连接redis单例模式

import redis

class RedisModel(object):
HOST = '127.0.0.1'
PORT = 6379
DBID = 0

def __init__(self):
if not hasattr(RedisModel, 'pool'):
RedisModel.create_pool()
self._connection = redis.Redis(connection_pool =  RedisModel.pool)
#python中，所有类的实例中的成员变量，都是公用一个内存地址，因此，及时实例化多个RedisCache类，内存中存在的pool也只有一个
@staticmethod
def create_pool():
RedisModel.pool = redis.ConnectionPool(
host = RedisDBModel.HOST,
port = RedisDBModel.PORT,
db   = RedisDBModel.DBID)