~cpp from Tkinter import * def frame(root, side): w = Frame(root) w.pack(side = side, expand=YES, fill=BOTH) return w def button(root, side, text, command=None): w = Button(root, text=text, command=command) w.pack(side=side, expand=YES, fill=BOTH) return w class calculator(Frame): def __init__(self): Frame.__init__(self) self.pack(expand=YES, fill=BOTH) self.master.title('simple calculator') self.master.iconname('calc1') display = StringVar() Entry(self, relief=SUNKEN, textvariable=display).pack(side=TOP, expand=YES, fill=BOTH) for key in ('123', '456', '789', '-0.'): keyF = frame(self, TOP) for char in key: button(keyF, LEFT, char, lambda w=display, s='%s' % char: w.set(w.get() + s)) opsF = frame(self, TOP) for char in "+-*/=": if char == '=': btn = button(opsF, LEFT, char) btn.bind('<ButtonRelease-1>', lambda e, s = self, w = display: s.calc(w), '+') else: btn = button(opsF, LEFT, char, lambda w = display, c = char : w.set(w.get() + ' ' + c + ' ')) clearF = frame(self, BOTTOM) button(clearF, LEFT, 'Clr', lambda w=display: w.set('')) def calc(self, display): try: display.set(repr(eval(display.get()))) except ValueError: display.set("Error") if __name__ == '__main__': calculator().mainloop();