Django wants to use redis for caching. Unable to connect to redis.

#setting.py中
CACHES={
    "default":{
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": "127.0.0.1:6379",
        'OPTIONS': {
            #"CLIENT_CLASS": "redis_cache.client.DefaultClient",
            "DB": 0,
            "PARSER_CLASS": "redis.connection.HiredisParser",
            "CONNECTION_POOL_CLASS": "redis.BlockingConnectionPool",
            "PICKLE_VERSION": -1     
        }
    }
}

#views.py
def testCache(request):

    print cache
    print dir(cache)
    mn = cache.get("test2")
    return HttpResponse(mn)

Please give me some guidance, why can’t I connect?