redis-py : What's the difference between StrictRedis() and Redis()?

I want to use redis-py for caching some data, but I can't find a suitable explanation of the difference between redis.StrictRedis() and redis.Redis(). Are they equivalent?

In addition, I can't find any clear documentation about redis.StrictRedis()'s arguments in Redis Python Docs. Any idea?

EDIT: They are now equivalent:

redis-py 3.0 drops support for the legacy "Redis" client class. "StrictRedis" has been renamed to "Redis" and an alias named "StrictRedis" is provided so that users previously using "StrictRedis" can continue to run unchanged.

Original answer: This seems pretty clear:

 redis-py exposes two client classes that implement these commands
 The StrictRedis class attempts to adhere to the official command syntax.

and

In addition to the changes above, the Redis class, a subclass of StrictRedis,
overrides several other commands to provide backwards compatibility with older
versions of redis-py

Do you need backwards compatibility? Use Redis. Don't care? Use StrictRedis.

2017-03-31

Here are the specifics of the backwards compatibility, from the github.com link cited:

In addition to the changes above, the Redis class, a subclass of StrictRedis, overrides several other commands to provide backwards compatibility with older versions of redis-py:

LREM: Order of 'num' and 'value' arguments reversed such that 'num' can provide a default value of zero.

ZADD: Redis specifies the 'score' argument before 'value'. These were swapped accidentally when being implemented and not discovered until after people were already using it. The Redis class expects *args in the form of: name1, score1, name2, score2, ...

SETEX: Order of 'time' and 'value' arguments reversed.

It's an old question but for anyone who reaches this question after google search:

from redis-py readme (link):

redis-py 3.0 drops support for the legacy "Redis" client class. "StrictRedis" has been renamed to "Redis" and an alias named "StrictRedis" is provided so that users previously using "StrictRedis" can continue to run unchanged.

Here is the line from redis-py code which defines StrictRedis (link):

StrictRedis = Redis