[Tutor] Tkinter query?

[Dave S]

Hi all,

Im on the Tkinter GUI learning curve :-) . Its going quite well - im
reading O'reilly 'programming python' but I am unclear on the following

I understand the standard form ie ...

root = Tk()
test = button(root, text = ..........).pack()
etc

I also understand ....

independant_win = Toplevel(root)

But I do not understand where Frame fits in to this ... ie

from Tkinter import *
class Hello(Frame):
   
    def __init__(self, parent=None):
        Frame.__init__(self, parent)
        self.pack()


Why not just use 'class Hello(root)' ? Or have I missed the point :-[

Dave