[Kivy] GUI properties defined (and changed) by variables in .py file

[buran]

main.py

from kivy.app import App
from kivy.properties import StringProperty
import values

class MainApp(App):
    label_text = StringProperty()
    def build(self):
        self.label_text = values.label_text
    def increment(self):
        self.label_text = str(int(self.label_text) + 1)
    def decrement(self):
        self.label_text = str(int(self.label_text) - 1)
 
if __name__ == '__main__':
    MainApp().run()

main.kv

Output:
BoxLayout:
    orientation: "vertical"
    Label:
        text: app.label_text
    Button:
        text: "increment"
        on_press: app.increment()
    Button:
        text: "decrement"
        on_press: app.decrement()

values.py

label_text = "0"

However I would use kivy.config and eventually add kivy.settings to initialize and have settings shown to user