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Subclass user-defined button class and redefined press-handler method

from Tkinter  import *       class HelloButton(Button):     def __init__(self, parent=None, **config):         Button.__init__(self, parent, config)         self.pack()         self.config(command=self.callback)     def callback(self):                   print 'Goodbye world...'          self.quit()       class MyButton(HelloButton):      def callback(self):               print "pressed"       MyButton(None, text='Hello subclass world').mainloop()