"""This example is part of Swampy, a suite of programs available from allendowney.com/swampy. Copyright 2011 Allen B. Downey Distributed under the GNU General Public License at gnu.org/licenses/gpl.html. """ def draw(t, length, n): """Draws a tree with the given trunk length and levels of recursion. Turtle ends up back where he started. Args: t: Turtle length: trunk length n: int levels of recursion """ if n == 0: return angle = 50 fd(t, length*n) lt(t, angle) draw(t, length, n-1) rt(t, 2*angle) draw(t, length, n-1) lt(t, angle) bk(t, length*n) bob = Turtle() bob.delay = 0.01 lt(bob) bk(bob, 70) draw(bob, 10, 7)