# pip install kivy

# pip install docutils pygments pypiwin32 kivy.deps.sdl2

# pip install kivy.deps.glew

import kivy

kivy.require("1.10.1")

from kivy.app import App

from kivy.uix.gridlayout import GridLayout

class CalcGridLayout(GridLayout):

def calculate(self, calculation):

if calculation:

try:

self.display.text = str(eval(calculation)) # eval() evaluates the passed string as a Python expression

# and returns the result.

# For example, eval("1 + 1") interprets and executes the expression "1 + 1"

# and returns the result (2)

except Exception:

self.display.text = "Error !"

class CalculatorApp(App):

def build(self):

return CalcGridLayout()

calcApp = CalculatorApp()

calcApp.run()