title: How do I make a turtle color fade
body: <p>How do I make a turtle color fade in python 2?</p>
  
  <p>I want to have a square that slowly fades to the middle with a turtle.</p>
  
  <pre><code>from turtle import Turtle
  t = Turtle()
  t.begin_fill()
  t.color('white')
  for counter in range(4):
      t.forward(100)
      t.right(90)
      t.color(+1)
  t.end_fill()
  </code></pre>