"""
 pong.py

 An implementation of pong[1]
 using Zelle's graphics library[2].

 [1] https://en.wikipedia.org/wiki/Pong
 [2] https://mcsp.wartburg.edu/zelle/python/

 Jim Mahoney | cs.marlboro.college | MIT License | Nov 2019
"""
from graphics import *

class Ball:
    pass

class Paddle:
    padd

class Screen:
    pass

def main():
    Screen().run()

if __name__ == '__main__':
    import doctest
    doctest.testmod()
    main()