Kivy Calculator

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.config import Config
Config.set('graphics', 'resizable', '0')
Config.set('graphics', 'width', '400')
Config.set('graphics', 'height', '500')


class CalculatorGridLayout(GridLayout):

    def calculate(self, calculation):
        if calculation:
            try:
                self.display.text = str(eval(calculation))
            except Exception:
                self.display.text = "Error"


class CalculatorApp(App):

    def build(self):
        return CalculatorGridLayout()


calcApp = CalculatorApp()
calcApp.run()