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import Tkinter as TKclass Row(TK.Frame):    handle = (lambda x,y: True)    def setup(self, labels):       for x in labels:            b = TK.Button(text=x, command=(lambda: self.handle(x)))            b.pack({'side':'left', 'expand':'yes'})            self.buttons.append(b)    def __init__(self, parent,row):        TK.Frame.__init__(self, parent)        self.buttons = []        self.setup(row)class KeyPad(TK.Frame):    def __init__(self, parent):        TK.Frame.__init__(self,parent)        self.rows = []        self.setup()    def addRow(self, row):        x = Row(self,row)        self.rows.append(x)        x.pack({'side':'top','expand':1})    def setup(self):        passx = TK.Tk()TK.Wm.title(x,'Test')kp = KeyPad(x)kp.addrow('abc')kp.addrow('def')kp.mainloop()