[Python] Moving Python graphics.py objects

I'm trying to move two objects at the same time in python graphics (This seems to be referring to John Zelle's graphics.py), then repeat the movement in a loop. However when I try to loop it, the shapes disappear. How can I fix this?

def main():
win = GraphWin('Lab Four', 400, 400)
c = Circle(Point(100, 50), 40)
c.draw(win)
c.setFill('red')
s = Rectangle(Point(300, 300), Point(350, 350))
s.draw(win)
s.setFill('blue')
s.getCenter()
while not c.getCenter() == Circle(Point(400, 50), 40):
c.move(10, 0)
s.move(-10, 0)
win.getMouse
while not (win.checkMouse()):
continue
win.close()

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