Heighway dragon fractal

heighway_dragon.py

import turtle


limit = 6
frac = 0.8


def draw(size, inv = False):
    if size > limit:
        t.lt(90)
        draw(size * frac)
    else:
        t.fd(size)

    t.lt(90) if inv else t.rt(90)

    if size > limit:
        draw(size * frac, True)
        t.rt(90)
    else:
        t.fd(size)


t = turtle.Turtle()
t.speed(0)

t.seth(0)
draw(1000)

win = turtle.Screen()
win.exitonclick()