ImportError: No module named redis

python中运行如下代码：

import redis
pool = redis.ConnectionPool(host=DB_REDIS_HOST, port=DB_REDIS_PORT, password=DB_REDIS_PWD)
redis_db = redis.Redis(connection_pool=pool, db=1)

报错： ImportError: No module named redis

redis是已经安装的

解决办法：Redis-py安装
easy_install redis