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import Tkinterclass C:    def __init__(self, app):        self.b = b = Tkinter.Button(app, command=self.command)        b.bind("<ButtonPress>", self.pressed)        b.bind("<ButtonRelease>", self.released)        b.pack()    def pressed(self, event):        print "the button was pressed"    def released(self, event):        print "the button was released"    def command(self):        print "the button's command was invoked"app = Tkinter.Tk()c = C(app)app.mainloop()