#!/usr/bin/python
# -*- coding: UTF-8 -*-

"""
题目:画椭圆ellipse。 
"""

if __name__ == '__main__':
 from Tkinter import *
 x = 360
 y = 160
 top = y - 30
 bottom = y - 30
 
 canvas = Canvas(width = 400,height = 600,bg = 'yellow')
 for i in range(20):
 canvas.create_oval(250 - top,250 - bottom,250 + top,250 + bottom)
 top -= 5
 bottom += 5
 canvas.pack()
 mainloop()