title: Python turtle after drawing , click mouse, clear screen and redraw
body: <p>I am working on using python turtle to draw a five -star.But I need to clear the screen and redraw it after I click it.
  So the process like this :</p>
  
  <p>Blank Screen</p>
  
  <ol>
  <li>Click mouse</li>
  <li>Start drawing star</li>
  <li>finish</li>
  <li>click mouse</li>
  <li>clear screen and re draw</li>
  </ol>
  
  <p>Thanks </p>
  
  <pre><code>import turtle
  wn = turtle.Screen()
  
  tess = turtle.Turtle()
  tess.hideturtle()
  
  tess.left(36)
  tess.forward(100)
  for a in range(4):
      tess.left(144)
      tess.forward(100)
  </code></pre>