What am I doing wrong in this simple tkinter example?

[Chris Angelico]

On Sun, Mar 17, 2013 at 1:53 AM, Yves S. Garret
<yoursurrogategod at gmail.com> wrote:
> 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?

    self.secret_txt.delete(0.0, END)
    self.secret_txt.delete(0.0, message)

Is the second one supposed to be adding text? I'm not familiar with
tkinter but that's the line with the error, and it looks a little odd.

ChrisA