[Tutor] another quickie

[max baseman]

hello all, im sorry but i might be asking a lot of Tkinter questions  
for a bit.
im still working on my first GUI, it is very simple all i want it to  
do is open a text file, write to it, than save it. so far i have a  
GUI with the ability to right text (nothing amazing), but i don't  
know how to have it display the text from a text file any help would  
be great

from Tkinter import *
top=Tk()
F=Frame(top)
F.pack()
F.txtBox=Text(top)
F.txtBox.pack()
F.pack()

this is all i have so far ^_^"