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import kivy.app
from kivy.app import App
from kivy.ulx.button import Button
from kivy.ulx.widget import Widget
from kivy.ulx.label import Label
from kivy.uix.gridlaidout import Gridlaidout
class CalculatorApp(App):
def build(self):
gl = Gridlaidout(cols = 4)
gl.add_wid...