python单例模式连接redis数据库

网上找了一圈单例模式连接redis，资源很少，找到了也是不可用的。自己动手写一个，测试可用。

import redis

class RedisModel(object):
    _pool = None
    def __init__(self):
        print('init')
        self._conn = redis.Redis(connection_pool=RedisModel._pool)

    def __new__(cls, *args, **kwargs):
        if not cls._pool:
            print('new')
            cls._pool = redis.ConnectionPool(
                host='127.0.0.1',
            )
        return super(RedisModel,cls).__new__(cls)

    def get(self):
        print(self._conn.llen('xxx'))

db1 = RedisModel()
db2 = RedisModel()
db3 = RedisModel()
db1.get()