Although you get infinite recursion with this code, you still get enough information on the error from the interpreter to help you debug.
Running IDLE, I get a traceback of: File "C:/Documents and Settings/Jordan/Desktop/more_blah.py", line 11, in __init__ self.createFrames() File "C:/Documents and Settings/Jordan/Desktop/more_blah.py", line 19, in createFrames textFrame=TextFrame(self,300,600) File "C:/Documents and Settings/Jordan/Desktop/more_blah.py", line 31, in __init__ RootFrame.__init__(self,parent,myHeight,myWidth) repeated indefinitely. At a glance, this tells you: * That __init__ (of the RootFrame method) calls self.createFrames() * createFrames(), in turn, calls TextFrame(self,300,600) * This leads to RootFrame.__init__ being called once more So theres youre infinite recursion. RootFrame's __init__ calls createFrames which creates a new TextFrame - meaning TextFrame.__init__ gets called, and this calls its parent's __init__ method, and so on ad infinitum. This is a pretty good demonstration of the prinicple that you should do as little as is nessecary to create an object - if possible, try to calling other methods on an object in its __init__ method. Without knowing more about youre program, and with only limited GUI building experience (and none in Python), I'd guess the most likely solution is for TextFrame to inherit from Tkinter.Frame directly - having it inheret from RootFrame doesn't really make much sense as far as I can see. TextFrame is, I would guess, intended as a component of RootFrame, not a subclass. Thats another important OO prinicple - don't overuse inheritance, often simple composition (one object having another as an attribute) is the right solution. If TextFrame really is supposed to inherit from RootFrame, try to explain why. -- http://mail.python.org/mailman/listinfo/python-list