text: #!~/envs/udacity-python-env
  
  import turtle
  
  
  def draw_square():
      window = turtle.Screen()
      window.bgcolor("black")
  
      bad = turtle.Turtle()
      bad.shape("turtle")
      bad.speed(3)
      bad.color("yellow")
  
      bad.forward(100)
      bad.right(90)
      bad.forward(100)
      bad.right(90)
      bad.forward(100)
      bad.right(90)
      bad.forward(100)
  
      window.exitonclick()
  
  
  draw_square()
  