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"""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()