from Tkinter import *

class Hello(Frame):                            # an extended Frame
    def __init__(self, parent=None):
        Frame.__init__(self, parent)           # do superclass init
        self.pack()
        self.data = 42
        self.make_widgets()                    # attach widgets to self
    def make_widgets(self):
        widget = Button(self, text='Hello frame world!', command=self.message)
        widget.pack(side=LEFT)
    def message(self):
        self.data = self.data + 1
        print 'Hello frame world %s!' % self.data

if __name__ == '__main__': Hello().mainloop()