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 'HI...'
self.quit()
if __name__ == '__main__':
HelloButton(None, {'text': 'Subclass'}).mainloop()