CALCULATOR APP KIVY

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 import kivy

from kivy.app import App
from kivy.properties import NumericProperty, StringProperty
from kivy.uix.gridlayout import GridLayout



class MainWidget(GridLayout):
    textnumber = StringProperty()
    addnumber = NumericProperty()
    nextnumber = NumericProperty()



    def zero(self):
        if  self.textnumber == "INVALID OPERATION":
            self.textnumber = str('')
        else:
            self.textnumber += str('0')




    def one(self):
        if  self.textnumber == "INVALID OPERATION":
            self.textnumber = str('')
        else:
            self.textnumber += str('1')


    def two(self):
        if  self.textnumber == "INVALID OPERATION":
            self.textnumber = str('')
        else:
            self.textnumber += str('2')


    def three(self):
        if  self.textnumber == "INVALID OPERATION":
            self.textnumber = str('')
        else:
            self.textnumber += str('3')

    def four(self):
        if  self.textnumber == "INVALID OPERATION":
            self.textnumber = str('')
        else:
            self.textnumber += str('4')

    def five(self):
        if  self.textnumber == "INVALID OPERATION":
            self.textnumber = str('')
        else:
            self.textnumber += str('5')


    def six(self):
        if  self.textnumber == "INVALID OPERATION":
            self.textnumber = str('')
        else:
            self.textnumber += str('6')


    def seven(self):
        if  self.textnumber == "INVALID OPERATION":
            self.textnumber = str('')
        else:
            self.textnumber += str('7')

    def eight(self):
        if  self.textnumber == "INVALID OPERATION":
            self.textnumber = str('')
        else:
            self.textnumber += str('8')

    def nine(self):
        if  self.textnumber == "INVALID OPERATION":
            self.textnumber = str('')
        else:
            self.textnumber += str('9')

    def decimal(self):
        if  self.textnumber == "INVALID OPERATION":
            self.textnumber = str('')
        else:
            self.textnumber += str('.')


    def division(self):
        if  self.textnumber == "INVALID OPERATION":
            self.textnumber = str('')
        else:
            self.textnumber += str(' / ')


    def addition(self):
        if  self.textnumber == "INVALID OPERATION":
            self.textnumber = str('')
        else:
            self.textnumber += str('+')

    def subtraction(self):
        if  self.textnumber == "INVALID OPERATION":
            self.textnumber = str('')
        else:
            self.textnumber += str(' - ')


    def multiplication(self):
        if  self.textnumber == "INVALID OPERATION":
            self.textnumber = str('')
        else:
            self.textnumber += str(' * ')


    def restart(self):
        self.textnumber = str('')


    def equal(self):
     try:
        number = str(eval(self.textnumber))
        self.textnumber = str(number)
        print(number)
     except SyntaxError:
        self.textnumber = str("INVALID OPERATION")










# we are defining the Base Class of our Kivy App
class myApp(App):
    def build(self):
        # return a MainWidget() as a root widget
        return MainWidget()


if __name__ == '__main__':
    # Here the class MyApp is initialized
    # and its run() method called.
    myApp().run()





KV FILE



# my.kv file code here
<MainWidget>:
    rows: 5
    cols: 4







   Label:

      size_hint: .2,.1


   Label:
      text: root.textnumber
      size_hint: .2,.1
      font_size: (self.height/15)* 3

   Label:
      text:
      size_hint: .2,.1



   Button:
      text: 'C'
      size_hint: .2,.1
      on_press: root.restart()
   Button:
      text: '1'
      size_hint: .2,.1
      on_press: root.one()

   Button:
      text: '2'
      size_hint: .2,.1
      on_press: root.two()

   Button:
      text: '3'
      size_hint: .2,.1
      on_press: root.three()

   Button:
      text: '+'
      size_hint: .2,.1
      on_press: root.addition()
   Button:
      text: '4'
      size_hint: .2,.1
      on_press: root.four()

   Button:
      text: '5'
      size_hint: .2,.1
      on_press: root.five()

   Button:
      text: '6'
      size_hint: .2,.1
      on_press: root.six()

   Button:
      text: '-'
      size_hint: .2,.1
      on_press: root.subtraction()

   Button:
      text: '7'
      size_hint: .2,.1
      on_press: root.seven()

   Button:
      text: '8'
      size_hint: .2,.1
      on_press: root.eight()
   Button:
      text: '9'
      size_hint: .2,.1
      on_press: root.nine()

    Button:
      text: 'X'
      size_hint: .2,.1
      on_press: root.multiplication()

   Button:
      text: '.'
      size_hint: .2,.1
      on_press: root.decimal()

   Button:
      text: '0'
      size_hint: .2,.1
      on_press: root.zero()
   Button:
      text: '/'
      size_hint: .2,.1
      on_press: root.division()

    Button:
      text: '='
      size_hint: .2,.1
      on_press: root.equal()