title: Shapesize code wouldn't work for some reason
body: <p>I tried to do something very similar from some other code but it didn't work even though i thought i did right thing. Also i tried copy pasting the whole code in <strong>trinket.io</strong> to find out that maybe it was in another version, i want to make a 3D rolling ball or something...
  error message:</p>
  <p>AttributeError: 'Turtle' object has no attribute 'shapesize' on line 25 in main.py</p>
  <p>Code:</p>
  <pre><code>import turtle as trtl
  
  di = trtl.Turtle()
  
  di.penup()
  screen = trtl.Screen()
  x = 0
  def go_left():
    global x
    x -= 5
    di.goto(x,-190)
  
  def go_right():
    global x
    x += 5
    di.goto(x,-190)
  
  screen.onkey(go_left, 'left')
  screen.onkey(go_right, 'right')
  t = 1
  di.shape(&quot;circle&quot;)
  def go_forward():
    global t
    t -= 5
    di.shapesize(t) #error
  screen.onkey(go_forward, 'up')
  screen.listen()
  def go_backward():
    global t
    t += 5
    di.shapesize(t) #error
  screen.onkey(go_backward, 'down')
  </code></pre>