Controlling the FPS with tk.after(ms, func).

In short, I wanted to control the frames per second within my main loop. This is how I did it.

fps = FPSController(fps=10)

def loop():
    root.after(fps.pause(), loop)

root = tk.Tk()
root.after(0, loop)
root.mainloop()

Now after is not called after a fixed given time, but it auto-corrects itself to maintain the given FPS.