Tkinter button not working as expected

[Fredrik Lundh]

vagrantbrad at yahoo.com wrote:

> Thank you Fredrik.  It makes total sense now that you've explained it
> this way.  I frustrated at my ignorance on the assignment issue :)

well, it's one of those "you'll only do this once" mistakes that 
*everyone* does (mutable default arguments and unexpected integer 
division are two of the others).

it's the "I'm always doing this" mistakes that are really frustrating 
(for me, "'str' object has no attribute 'startwith'" is at the top of 
that list...)

</F>