This repo demonstrates a couple of tests with pygame joysticks.
The main_test.py file uses the Pygame Joystick API, the default API used by pygame. This can be a hassle to work with, because you have to map controllers manually, or create a file with a database of controllers.
The main.py file uses the Pygame SDL2 Controller API that unifies controller buttons, making less of a hassle to work with, since the SDL2 database already includes many controller mappings, and you don't have to map them yourself.