Exiting Tkinter when using IDLE

Jason Harper JasonHarper at pobox.com
Fri Mar 12 20:21:22 CET 2004

An update to this advice I gave:

> 1. Don't use the quit method, instead just close your window.  Your QUIT
> button could perhaps use:
>       command=self.destroy
> 2. Don't call mainloop() if IDLE already has one running.  Try this:
> import sys
> if "idlelib" not in sys.modules:
>       root.mainloop()

This only works (on Windows, at least) if IDLE is _not_ running user
code in a subprocess.  I've not found any combination of options that
gets usable results (including the ability to introspect the program
while running) when using a subprocess.

Also, it seems to leave the process running forever if launched outside
of IDLE, even after all the windows are closed.  The simplest solution,
assuming a single-window application, seems to be giving the main window
a WM_DELETE_WINDOW protocol handler that does a self.quit(), but only if
IDLE isn't running (determined as shown above).

Here's a little inconsistency that had me really confused for a while:
IDLE, when run from the Start menu (Win2K Pro, Python 2.3.3), uses a subprocess.
IDLE, when run via "Open in IDLE" in a .py* file's right-click menu,
does NOT use a subprocess.
I haven't tracked down just where this difference is coming from.
	Jason Harper

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