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()