I have created a window using
pygame.display.set_mode((width, height),
pygame.OPENGL | pygame.DOUBLEBUF | pygame.RESIZABLE)
Later on in the app I want to be able to ask that window its width and height so I can decide how to process the mouse position.
How do I access the dimensions of that pygame window elsewhere in the program? (event processing loop)
You want to get the surface, then get the size from the surface object.
Using tuple unpacking:
w, h = pygame.display.get_surface().get_size()