import turtle


wn = turtle.Screen()
r = 'r'
l = 'l'
display_width = 800
display_height = 600
turtle.setup(display_width, display_height)
old = r
new = old

iteration = 11
length = 5
pencolor = (0, 0, 0)
bgcolor = (1, 1, 1)

cycle = 1

while cycle < iteration:

    new = (old) + (r)

    old = old[::-1]

    for char in range(0, len(old)):
        if old[char] == r:
            old = (old[:char]) + (l) + (old[char + 1:])
        elif old[char] == l:
            old = (old[:char]) + (r) + (old[char + 1:])

    new = (new) + (old)
    old = new

    cycle = cycle + 1

turtle.ht()
turtle.speed(0)
turtle.color(pencolor)
turtle.bgcolor(bgcolor)

turtle.forward(length)

for char in range(0, len(new)):
    if new[char] == (r):
        turtle.right(90)
        turtle.forward(length)
    elif new[char] == (l):
        turtle.left(90)
        turtle.forward(length)
wn.exitonclick()