title: AttributeError: 'module' object has no attribute 'Screen'
body: <p>I'm trying to make a square with python.
  Here's the code:</p>
  
  <pre><code>import turtle
  
  def draw_square():
  
      window = turtle.Screen()
      window.bgcolor("red")
  
      brad = turtle.Turtle()
      brad.shape("turtle")
      brad.color("yellow")
      brad.speed(2)
  
      brad.forward(100)
      brad.right(90)
      brad.forward(100)
      brad.right(90)
      brad.forward(100)
      brad.right(90)
      brad.forward(100)
      brad.right(90)
  
  
      window.exitonclick()
  draw_square()
  </code></pre>
  
  <p>But I get this error:</p>
  
  <pre><code>File "C:/Python27\turtle.py", line 4, in draw_square
    window = turtle.Screen()
  AttributeError: 'module' object has no attribute 'Screen'
  </code></pre>