GUI Tk Python

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 'Hiiii...'                     
        self.quit()
class MyButton(HelloButton):        
    def callback(self):             
        print "Ignoring press!..."
if __name__ == '__main__':
    MyButton(None, text='My Button').mainloop()