"""This module contains a code example related to
Think Python, 2nd Edition
by Allen Downey
http://thinkpython2.com
Copyright 2015 Allen Downey
License: http://creativecommons.org/licenses/by/4.0/
"""
from __future__ import print_function, division
import turtle
def koch(t, n):
"""Draws a koch curve with length n."""
if n < 10:
t.fd(n)
return
m = n/3
koch(t, m)
t.lt(60)
koch(t, m)
t.rt(120)
koch(t, m)
t.lt(60)
koch(t, m)
def snowflake(t, n):
"""Draws a snowflake (a triangle with a Koch curve for each side)."""
for i in range(3):
koch(t, n)
t.rt(120)
bob = turtle.Turtle()
bob.pu()
bob.goto(-150, 90)
bob.pd()
snowflake(bob, 300)
turtle.mainloop()
