Python Tkinter: Update scrolled Listbox - wandering scroll position
<p>I wanted to display a long list of string items that is regularly updated in a scrollable GUI Window.
Loving the use of free included batteries I used Tkinter, and ran into a few problems:</p>

<ul>
<li>Tkinter Listbox has no way to update items, you have to delete and reinstert them.</li>
<li>reinserting makes the scrollbar wander upwards</li>
<li>total Tkinter beginner</li>
</ul>

<p>I solved this, and will share the solution as an answer to this question.
If you know a better way, please post an improved answer.</p>