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str(eval(self.entry.get())) self.entry.delete(0, tk.END) self.entry.insert(0, result) except: self.entry.delete(0, tk.END) self.entry.insert(0, "Error") elif text == "C": self.entry.delete(0, tk.END) elif text == "CE": self.entry.delete(len(self.entry.get())-1, tk.END) else: