# coding=UTF-8
# 题目:利用ellipse 和 rectangle 画图。。

if __name__ == '__main__':
 from Tkinter import *

 canvas = Canvas(width=400, height=600, bg='white')
 left = 20
 right = 50
 top = 50
 num = 15
 for i in range(num):
 canvas.create_oval(250 - right, 250 - left, 250 + right, 250 + left)
 canvas.create_oval(250 - 20, 250 - top, 250 + 20, 250 + top)
 canvas.create_rectangle(20 - 2 * i, 20 - 2 * i, 10 * (i + 2), 10 * (i + 2))
 right += 5
 left += 5
 top += 10

 canvas.pack()
 mainloop()