[Python] is the code on the right track if exercise ask to have just a ball bouncing around on...

#I'm trying to make a ball that bounce around and when reach the edged of the window change direction , as the exercise is asking to me , have you clues about how to think to accomplish this ?

def ball():
print("This program will show a ball bouncing around within the window")


update(100)

win = GraphWin("Ball",400,400)
win.setBackground("white")
win.setCoords(-10,-10,10,10)
dx = 1
dy = 1

for _ in range(10000):

ball = Circle(Point(dx,dy),2)
ball.setFill("black")
ball.draw(win)
dx += 1
dy += 1

if dx >= 8:
dx = -1
elif dx <= -8:
dx = 1

if dy >= 8:
dy = -1
elif dy <= -8:
dy = 1
ball.undraw()

ball()

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