One of the more recent versions of sparse will cause a bug when you try to import a Triangle. I'm guessing it's 0.16.0 since the release before that, 0.15.5, works fine. Looks like the new version ...

Since Python 3.12 has removed the imp module, a possible solution is to either use Python 3.11 or replace the imp module calls with importlib. With this link, the imp.load_source() should be replaced ...