Hi Terry,

I originally had txtfont as a list, but I guess I was worried about readability and accessing attributes by indices being unpythonic. But I might have been over-doing it for this case. :)

In Mac, you don't need to divide event.delta by 120, only Windows and X11 systems. This is according to a Stackoverflow answer: http://stackoverflow.com/questions/17355902/python-tkinter-binding-mousewheel-to-scrollbar

But maybe I'm wrong? I've attached my small change.