When trying to install pygame for Python3 on my mac I mainly followed this guide. However, this ultimately didn't accomplish anything, aside from screwing something up in my Terminal path and giving me the problem described here, which I can temporarily fix using the commands given in that thread, but I usually have to enter them again each time I close and re-open Terminal.
Next I tried just installing the 32-bit version of Python2 instead, and then doing the basic install of the corresponding version of pygame from pygame.org. This actually got pygame working to a certain extent, but it crashes immediately when I try to run a script a colleague wrote.
Which brings me here. I want to just uninstall everything and start from scratch so that I can hopefully find a way to correctly install pygame (it would be great if someone could point me to a guide for how to do this that isn't like 4 years old), and also to permanently fix the problem with my Terminal path. I grew up on Windows, so I already have a hard time uninstalling "normal" programs since OS X lacks a formal uninstall tool. So when it comes to uninstalling a program that was installed through Terminal and for which there is essentially no evidence of outside of some files in folders that are more or less hidden, I'm completely lost.