newbie IDLE, Tkinter

[Nick Perkins]

I have been playing around with Python and Tkinter, using the IDLE prompt
and edit windows.

I am a little confused about what happens when I run my tkinter programs,
then close them (by closing their window).  Sometimes I come back to the
prompt, sometimes the interactive window just seems to hang, and sometimes
the whole IDLE program just quits.

Can someone explain the best way to interactively edit and test a tkinter
program with IDLE?  Do these window-closing behaviours depend on how I
actually run my program?