[ThePhysicist]

I wrote a very similar, Redis-based lock in Python a while ago, here it is:

https://gist.github.com/adewes/6103220

It uses Redis pipelines and watchers to make sure that no race conditions between two processes requiring the same lock occur, and uses "expire" keys to avoid deadlocks.

[klibertp]

I prefer Lua-scripting based approach: https://github.com/bbangert/retools/blob/master/retools/lock..., but I had to implement something similar to your code to support older Redis versions.

[thezilch]

You should just use redis-py's Lock (https://github.com/andymccurdy/redis-py/blob/master/redis/cl...)