Redis.from_url is not supported

[kfirco]

I have the following code which supposes to create a new Redis client based on the from_url class method, which is supported by redis-py

`
import retry_redis

class Redis(retry_redis.Redis):
def new(cls, *args, **kwargs):
redis_client = retry_redis.Redis.from_url('http://my-url' )
return redis_client
`

When running, I receive the following error:
AttributeError: type object 'Redis' has no attribute 'from_url'

The code is working when I'm inheriting from redis-py Redis class.
The problem is probably with the 'getattr' method which only works for non-class methods