title: Tkinter: How can I determine the position of a Toplevel?
body: <p>The title says it all really, I have a piece of code in which I would like to move the top-level in relation to its old position.  </p>
  
  <p>To do this I need to fetch the current position of the window, then set the new position using <code>root.geometry('+x+y')</code>.  How can I find the current position of a TopLevel?</p>