I want to know what the best tool for drawing in real-time is. i.e. I don't want to create static images, but do something like draw to a canvas and keep adding to it with the display updating in realtime. The options seem endless -- pygame, pyglet, Tk canvas, QT canvas, maybe PyCairo can do it. Is there a best choice? I want it to be a fast an inexpensive operation so it doesn't slow the rest of my code down much.