Branching spiral

fractal.py

#!/usr/bin/python3


import turtle
import math


MIN_LENGTH = 2

#FACTOR = (3/2) + math.sqrt(5)/2
FACTOR = 2


def fractal(length):
    if length < MIN_LENGTH:
        return
    turtle.forward(length)
    turtle.right(90)
    turtle.forward(length)
    turtle.right(90)
    fractal(length/FACTOR)
    turtle.right(90)
    turtle.forward(length/2)
    turtle.right(90)
    fractal(length/FACTOR)
    turtle.left(90)
    turtle.forward(length/2)
    turtle.left(90)
    turtle.forward(length/2)
    turtle.right(90)
    fractal(length/FACTOR)
    turtle.left(90)
    turtle.forward(length/2)
    turtle.left(180)


if __name__ == '__main__':
    turtle.speed(10)
    turtle.left(90)
    fractal(100)
    while True:
        pass