如何从Python中的另一个应用程序捕获和处理实时活动？

I'm a computer science student, and as a personal project, I'm interested in building software that can watch and produce useful information about Super Nintendo games being run on a local emulator. This might be things like current health, current score, etc., (anything legible on the screen). The emulator runs in windowed form (I'm using SNES9x) and so I wouldn't need to capture every pixel on the screen, and I'd only have to capture about 30fps.I'm a computer science student, and as a person