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# ballclass.py

from turtle import Turtle, exitonclick

class Ball(Turtle):

"""Round turtle that bounces."""

def __init__(self):

super().__init__()

self.shape("circle")

self.penup()

self.speed(0)

def move(self):

"""Move forward, bouncing against right side."""

self.forward(5)

if self.xcor() > 340:

self.left(180)

def main():

ball = Ball()

for _ in range(100):

ball.move()

exitonclick()

if __name__ == "__main__":

main()