Original author here. Saw a lot of traffic to my GitHub repo and wondered where it was coming from.
The Python clone I wrote is pretty cool and minimal, but I'm much more proud of a clone I later wrote in C:
https://github.com/fogleman/Craft
This one is much more performant and has way more features, including online multiplayer. The server is in Python.
Here's a video of it:
https://www.youtube.com/watch?v=tScCneiTGm4
Anyway, happy to answer any questions.