[Tutor] Fun with Label and Entry--Why NoneType?

[Alan Gauld]

"John Fouhy" <john at fouhy.net> wrote
>> Unfortunately, that takes me back to the original situation. That 
>> is, the
>> blank window appears along with the dialog window. It also ends 
>> badly with

> I didn't notice any call to root.mainloop() in your original code.
> Are you calling mainloop() anywhere?

I noticed that too but it doesn't seem to need a mainloop call, I
assume that is happening somewhere in the inherited Dialog
framework, but I've no idea how/where!

But an event loop is surely running somewhere!

Alan G.