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()

   import random
   from turtle import Turtle, Screen

   tim = Turtle()
   tim.shape("classic")

   def turtle_color():
    R = random.random()
    G = random.random()
    B = random.random()
    return tim.pencolor(R, G, B)


   tim.speed("fastest")


   for _ in range(72):
    turtle_color()
    tim.circle(100)
    tim.left(5)


   screen = Screen()
   screen.exitonclick()

   import turtle
   tina = turtle.Turtle()
   tina.shape('turtle')

   tina.penup()
   tina.goto(30,-150)
   tina.pendown()
   tina.circle(130)
   tina.penup()
   tina.goto(0,0)
   tina.pendown()
   tina.circle(20)
   tina.circle(10)
   tina.penup()
   tina.forward(60)
   tina.right(45)
   tina.pendown()
   tina.circle(30)
   tina.circle(10)
   tina.penup()
   tina.right(90)
   tina.forward(90)
   tina.pendown()
   tina.circle(40)
   tina.penup()
   tina.goto(25,-25)

   filter_list([1,2,'a','b']) == [1,2]
   filter_list([1,'a','b',0,15]) == [1,0,15]
   filter_list([1,2,'aasf','1','123',123]) == [1,2,123]