How can I write button text to a variable, not a string, in kivy?

Question

Kivy

Here is my code:
from kivy.app import App
from kivy.uix.button import Button
bag = 0
class Clicker(App):
def build(self):
return Button(text='0', font_size=45,
on_press=self. btn_press,
background_color = [0, 1, .5, .7],
background_normal = '')
def btn_press(self, btn):
btn.text = '1'

if __name__ == "__main__":
Clicker().run( )

I would like that instead of inline input of the text of the button, I entered the text in the variable button.

PS: 'The idea: to make a clicker so that after pressing the button, one is added.'

Answer 1

Well, get some kind of global variable, which you increase for each click, and change the text for each click. What exactly is the problem?