A Concise Introduction to Programming in Python

Chapter 25

Related Classes

Classes may also be related to each other through a mechanism called in-

heritance. When one class inherits from another, it inherits all the state and

behavior of the original class, and then has the opportunity to define addi-

tional new state and behavior.

The Sierpinski triangle is an interesting mathematical object (a fractal,

like the Mandelbrot set) that is constructed by rep eatedly removing the middle

from a solid triangle.

Listing 25.1: Sierpinski Triangle

1 # sierpinski.py

2

3 from turtle import Turtle, setworldcoordinates, exitonclick

4

5 class SierpinskiTriangle(Turtle):

6 size = 2

7 def __init__(self, n, x, y):

8 Turtle.__init__(self, ...