GUI Tk Python

from Tkinter import *    
class Hello(Frame):      
    def __init__(self, parent=None):
        Frame.__init__(self, parent)          
        self.pack()
        self.data = 42
        self.make_widgets()                   
    def make_widgets(self):
        widget = Button(self, text='Button!', command=self.message)
        widget.pack(side=LEFT)
    def message(self):
        self.data = self.data + 1
        print 'Hello frame world %s!' % self.data
class HelloContainer(Frame):
    def __init__(self, parent=None):
        Frame.__init__(self, parent)
        self.pack()
        self.makeWidgets()
    def makeWidgets(self):
        Hello(self).pack(side=RIGHT)
        Button(self, text='Attach', command=self.quit).pack(side=LEFT)
if __name__ == '__main__': HelloContainer().mainloop()