Exercise 4.2-Answer

from: http://openbookproject.net/thinkcs/python/english3e/functions.html#exercises

Write a program to draw this. Assume the innermost square is 20 units per side, and each successive square is 20 units bigger, per side, than the one inside it.

 

  1: # -*- coding: UTF-8 -*-
  2: #!/usr/bin/env python
  3: 
  4: import turtle
  5: 
  6: def createWindow(bgcolor, title):
  7:     w = turtle.Screen()
  8:     w.bgcolor(bgcolor)
  9:     w.title(title)
 10:     return w
 11: 
 12: def createTurtle(color, size):
 13:     t = turtle.Turtle()
 14:     t.pensize(size)
 15:     t.color(color)
 16:     return t
 17: 
 18: def jump(t, l):
 19:     t.penup()
 20:     t.backward(l)
 21:     t.right(90)
 22:     t.forward(l)
 23:     t.left(90)
 24:     t.pendown()
 25: 
 26: def draw_square(t, l):
 27:     for i in range(4):
 28:         t.forward(l)
 29:         t.left(90)
 30:     jump(t, 10)
 31: 
 32: wn = createWindow("lightgreen", "Exercises 4.2")
 33: tess = createTurtle("hotpink", 3)
 34: 
 35: for i in range(5):
 36:     draw_square(tess, 20 * (i + 1))
 37: 
 38: wn.mainloop()
 39: