Here's a tip to help new Tkinter programmers avoid the trouble I had because
of an error in Grayson's book Python and Tkinter Programming published by
Manning. On page 309, the protocol methods are briefly explained, with an
example:
self.root.protocol(WM_DELETE_WINDOW, self.cleanup)
This does not work. There is no error correction in the errata page on the
Manning site for the book. I finally figured out that WM_DELETE_WINDOW is
not a pre-defined constant like TOP, but rather should be a string in
quotes. The correct way to invoke the protocol to intercept toplevel
window closing is:
self.root.protocol("WM_DELETE_WINDOW", self.cleanup)
I wrote to Manning to have them add this to their errata, but just in case
they don't do it, I wanted to post this correction note here for others to
find.
--
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