《PYTHON语言程序设计》(2018版)1.20修改这道题，利用类的方式，做一个随机出现的立方体（上）建立矩形函数def draw_rectangle

这道立方体的外形，是规则的。我们用简单的办法就是直接输入这个立方体的坐标。
代码如下：

import turtle
turtle.showturtle()
turtle.write("0,0")
turtle.forward(200)
turtle.write("200,0")
turtle.right(90)
turtle.forward(100)
turtle.write("200,-100")
turtle.right(90)
turtle.forward(200)
turtle.write("0,-100")
turtle.right(90)
turtle.forward(100)
turtle.goto(-50,-50)
turtle.write("-50,-50")
turtle.right(90)
turtle.forward(200)
turtle.write("150,-50")
turtle.right(90)
turtle.forward(100)
turtle.write("150,-150")
turtle.right(90)
turtle.forward(200)
turtle.write("-50,-150")
turtle.right(90)
turtle.forward(100)
turtle.penup()
turtle