Fractal Plant with Python Turtle

As described in http://en.wikipedia.org/wiki/L-system#Example_7:_Fractal_plant.

Here is the result:

The code could be found below from GitHub Gist.

	# As described in http://en.wikipedia.org/wiki/L-system#Example_7:_Fractal_plant
	import turtle
	ruleInput = ['F', 'X']
	ruleOutput = ["FF", "F-[[X]+X]+F[+FX]-X"]
	start = "X"
	front = 5
	turn = 30
	stack = []
	dirstack = []
	turtle.left(90)
	turtle.penup()
	turtle.setpos(0, -350)
	turtle.pendown()
	turtle.shape("turtle")
	def generate(iteration):
	result = start
	temp = ""
	for i in range(iteration):
	for j in range(len(result)):
	for k in range(len(ruleInput)):
	if (result[j] == ruleInput[k]):
	temp += ruleOutput[k]
	break
	if (k == len(ruleInput)-1):
	temp += result[j]
	result = temp
	temp = ""
	return result
	def draw(input):
	for x in input:
	if (x == 'F'):
	turtle.forward(front)
	elif (x == '-'):
	turtle.left(turn)
	elif (x == '+'):
	turtle.right(turn)
	elif (x == '['):
	stack.append(turtle.pos())
	dirstack.append(turtle.heading())
	elif (x == ']'):
	turtle.penup()
	post = stack.pop()
	direc = dirstack.pop()
	turtle.setpos(post)
	turtle.setheading(direc)
	turtle.pendown()
	turtle.hideturtle()
	turtle.done()
	draw(generate(6))

view raw Python Turtle Fractal Plant.py hosted with ❤ by GitHub

view raw Result.md hosted with ❤ by GitHub