Hello , I am no expert on tkinter but this seems like an inheritance question. When you define a class that inherits from something ( Frame ) and you define an __init__ in your class you have to explicitly call the __init__ of your base class.
class xxx(base): """ This class doesn't have an __init__ defined. base.__init__ is called instead """ def method_a(self): pass class xxx(base): """ This class defines an __init__ and has to explicitly call the base.__init__ """ def __init__(self): """Python calls me if I am defined""" base.__init__(self) You will see this in more than GUI code, it is part of Python's OO design. I first saw this in some threading code , thru me for a loop too ;) search strategy: Python OO Python inheritance etc... hth, M.E.Farmer yang wrote: > I just a newbie of python > Now I found that almost every program use Tkinter have this line > > class xxx(xxx): > """xxxxx""" > > def __init__(self): > """xxxxx""" > > Frame.__init__(self) > ..................... > ....... > > > the line "Frame.__init__(self)" puzzle me. > why use it like this? > can some one explain it? > regards, > yang -- http://mail.python.org/mailman/listinfo/python-list