What am I doing wrong in this simple tkinter example?

Newsgroups	comp.lang.python
Date	2013-03-16 07:53 -0700
Message-ID	<faa34261-957e-4011-8399-616da73e7a36@googlegroups.com> (permalink)
Subject	What am I doing wrong in this simple tkinter example?
From	"Yves S. Garret" <yoursurrogategod@gmail.com>

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Hi all, I'm well into "Python Programming for the Absolute Beginner" in order to 
become more acquainted with the language.  However, when I got to page 304 and 
did my first example:

http://bin.cakephp.org/view/1107093008

And this is the error that I'm getting:

http://bin.cakephp.org/view/399711843

This is the code that came with the book:

http://bin.cakephp.org/view/514822432


What I don't understand is, why am I getting that error?  I've done diff -w
and the code looks for the most part the same.  What am I doing wrong when I
put the application together?

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What am I doing wrong in this simple tkinter example? "Yves S. Garret" <yoursurrogategod@gmail.com> - 2013-03-16 07:53 -0700
  Re: What am I doing wrong in this simple tkinter example? Chris Angelico <rosuav@gmail.com> - 2013-03-17 02:08 +1100
    Re: What am I doing wrong in this simple tkinter example? "Yves S. Garret" <yoursurrogategod@gmail.com> - 2013-03-16 08:14 -0700
      Re: What am I doing wrong in this simple tkinter example? Christian Gollwitzer <auriocus@gmx.de> - 2013-03-16 16:31 +0100
    Re: What am I doing wrong in this simple tkinter example? "Yves S. Garret" <yoursurrogategod@gmail.com> - 2013-03-16 08:14 -0700
  Re: What am I doing wrong in this simple tkinter example? Mitya Sirenef <msirenef@lightbird.net> - 2013-03-16 11:10 -0400
    Re: What am I doing wrong in this simple tkinter example? "Yves S. Garret" <yoursurrogategod@gmail.com> - 2013-03-16 08:16 -0700
      Re: What am I doing wrong in this simple tkinter example? Chris Angelico <rosuav@gmail.com> - 2013-03-17 02:23 +1100
        Re: What am I doing wrong in this simple tkinter example? "Yves S. Garret" <yoursurrogategod@gmail.com> - 2013-03-16 08:34 -0700
          Re: What am I doing wrong in this simple tkinter example? Chris Angelico <rosuav@gmail.com> - 2013-03-17 02:44 +1100
            Re: What am I doing wrong in this simple tkinter example? Neil Cerutti <neilc@norwich.edu> - 2013-03-19 14:11 +0000
        Re: What am I doing wrong in this simple tkinter example? "Yves S. Garret" <yoursurrogategod@gmail.com> - 2013-03-16 08:34 -0700
      Re: What am I doing wrong in this simple tkinter example? Mitya Sirenef <msirenef@lightbird.net> - 2013-03-16 11:48 -0400
    Re: What am I doing wrong in this simple tkinter example? "Yves S. Garret" <yoursurrogategod@gmail.com> - 2013-03-16 08:16 -0700

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