from graphics import * w = GraphWin('test',801,401) w.setCoords(0,0,800,400) c = Circle(Point(20,200),20) c.setFill('blue') c.draw(w) speed = 1.0 for x in range(200): c.move(speed,0) speed = 2.0 for x in range(200): c.move(speed,0) speed = 0.5 for x in range(200): c.move(speed,0)