It is research code (read very unpolished) but you can get inspiration from pyggp [1]. More specifically, the game_description_language module. I implemented pyggp for my masters thesis. It's a proof of concept and will be iterated upon.

[1] github.com/Entze/pyggp

I learned about GDL several years ago from folk working on General Game Player AIs, that is AI that could play any well described game. They were working primarily in Java at the time. A casual search show that, shockingly, there is no python library available for GDL (yet), they are still using Java.

http://www.ggp.org/

https://github.com/ggp-org/