import turtle
   def star(turtle, n,r):
   for k in range(0,n):
    turtle.pendown()
    turtle.forward(r)
    turtle.penup()
    turtle.backward(r)
    turtle.left(360/n)
 
   def recursive_star(turtle, n, r, depth, f):
 
   if depth == 0:
    star(turtle, n, f*4)
   else:
    for k in range(0,n):
        turtle.pendown()
        turtle.forward(r)
        recursive_star(turtle, n, f*r, depth - 1,f)
        turtle.penup()
        turtle.backward(r)
        turtle.left(360/n)
 
   turtle.speed("fastest")
   recursive_star(turtle, 5 , 150, 4, 0.4)

   from turtle import * 

   speed(0)
   pencolor('white') 
   bgcolor('black') 

   x = 0
   up()
   rt(45) 
   fd(90)
   rt(135)
   down()

   while x < 120: 
    fd(200)     
    rt(61)
    fd(200)
    rt(61)
    fd(200)
    rt(61)
    fd(200)
    rt(61)
    fd(200)
    rt(61)
    fd(200)
    rt(61)

    rt(11.1111) 
    x = x+1 

   exitonclick() 

   import turtle

   Alfred = turtle.Turtle()
   Alfred.color("blue")

   Alfred.penup()
   Alfred.goto(-75,-75)
   Alfred.pendown()

   #Picking up speed
   for i in range(50):
    Alfred.speed(i+1)
    Alfred.forward(150)
    Alfred.left(85)

   Alfred.penup()
   Alfred.goto(-25,-25)
   Alfred.pendown()
   Alfred.setheading(0)

   #Slowing down
   for i in range(30):
    Alfred.speed(30-i)
    Alfred.forward(50)
    Alfred.left(85)

   turtle.exitonclick()

   [7, 1]  =>  [1, 7]
   [5, 8, 6, 3, 4]  =>  [3, 8, 6, 5, 4]
   [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]  =>  [1, 8, 3, 6, 5, 4, 7, 2, 9, 0]

   from turtle import Screen, Pen
   import colorsys

   screen = Screen()
   screen.title("Rainbow Spiral")

   pen = Pen()
   pen.speed('fastest')

   hue = 0.0  # range is 0.0 to 1.0

   for i in range(200):
    color = colorsys.hsv_to_rgb(hue, 1, 1)  # pen wants RGB
    pen.pencolor(color)
    pen.forward(i * 2)  # double size
    pen.right(121)  # 120 degrees is an equilateral triangle
    hue += 0.005  # increment by 1/200

   pen.hideturtle()

   screen.exitonclick()