This mod is an addon for the Cotton Scripting API and Cotton Tweaker system. It adds support for running Python 2.7 scripts using the Jython Python interpreter.
Why not Python3?
Python 2 is about to die in about less than a year [PEP 373]
In reply to Fixator10:
I've been searching for two weeks now to find a JSR-223 compliant Python interpreter with no luck. While I personally prefer Python 3 and wish this was for Python 3 instead, I just haven't been able to find one that would work.