"""
boom van levy
"""

def levy(n):
    if n==0:
        return "F";
    else:
        symbols = levy(n-1)
        return symbols.replace("F","F") """vervang F door een ander patroon"""

for i in range(4):
    print (levy(i))


lengte = 200
recursiediepte = 3

import turtle
turtle.speed(11)  # 11 is fastest

commando = levy(recursiediepte)
turtle.penup();
turtle.goto(-100,0)
turtle.pendown()
#turtle.left(180)

for i in range(0, len(commando)):
    letter = commando[i]
    if(letter == 'F'):
        turtle.forward(lengte)
    """ vul aan met andere commando's """    

#print("done")
turtle.exitonclick()