android - Display property in Python Kivy -

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i have been watching tutorial kivy , python creating calculator, i've seen property: display value of widget id. value can access other properties of widget. here code (.kv file):

<calcgridlayout>:     id: calculator     display: entry #this display property     rows: 5     padding: 10     spacing: 10      boxlayout:         textinput:             id: entry #with value of             font_size: 32             multiline: false      boxlayout:         spacing: 10         button:             text: "7"             on_press: entry.text += self.text         button:             text: "8"             on_press: entry.text += self.text         button:             text: "9"             on_press: entry.text += self.text         button:             text: "+"             on_press: entry.text += self.text      boxlayout:         spacing: 10         button:             text: "4"             on_press: entry.text += self.text         button:             text: "5"             on_press: entry.text += self.text         button:             text: "6"             on_press: entry.text += self.text         button:             text: "-"             on_press: entry.text += self.text      boxlayout:         spacing: 10         button:             text: "1"             on_press: entry.text += self.text         button:             text: "2"             on_press: entry.text += self.text         button:             text: "3"             on_press: entry.text += self.text         button:             text: "*"             on_press: entry.text += self.text      boxlayout:         spacing: 10         button:             text: "ac"             on_press: entry.text = ""         button:             text: "0"             on_press: entry.text += self.text         button:             text: "="             on_press: calculator.calculate(entry.text)         button:             text: "/"             on_press: entry.text += self.text

what variable/property? used for?

with reference kv file:

calc.kv

display: entry

main.py

display = objectproperty(none)

display - variable , declared python object, objectproperty. used reference textinput child widget created kv rule. after declaring objectproperty, hook child widget created in kv rule e.g. "display: entry". once that's done, can reference textinput property inside calculate method.

example

main.py

from kivy.app import app kivy.uix.gridlayout import gridlayout kivy.properties import objectproperty   class calcgridlayout(gridlayout):     display = objectproperty(none)      def calculate(self, dt):         print(self.display.text)   class calcapp(app):      def build(self):         return calcgridlayout()   if __name__ == '__main__':     calcapp().run()

calc.kv

#:kivy 1.10.0  <calcgridlayout>:     id: calculator     display: entry #this display property     rows: 5     padding: 10     spacing: 10      boxlayout:         textinput:             id: entry #with value of             font_size: 32             multiline: false      boxlayout:         spacing: 10         button:             text: "7"             on_press: entry.text += self.text         button:             text: "8"             on_press: entry.text += self.text         button:             text: "9"             on_press: entry.text += self.text         button:             text: "+"             on_press: entry.text += self.text      boxlayout:         spacing: 10         button:             text: "4"             on_press: entry.text += self.text         button:             text: "5"             on_press: entry.text += self.text         button:             text: "6"             on_press: entry.text += self.text         button:             text: "-"             on_press: entry.text += self.text      boxlayout:         spacing: 10         button:             text: "1"             on_press: entry.text += self.text         button:             text: "2"             on_press: entry.text += self.text         button:             text: "3"             on_press: entry.text += self.text         button:             text: "*"             on_press: entry.text += self.text      boxlayout:         spacing: 10         button:             text: "ac"             on_press: entry.text = ""         button:             text: "0"             on_press: entry.text += self.text         button:             text: "="             on_press: calculator.calculate(entry.text)         button:             text: "/"             on_press: entry.text += self.text




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