from kivy.app import App
from kivy.lang import Builder
from kivy.uix.gridlayout import GridLayout
Builder.load_string('''
<Grid>:
    cols:3
    rows:3
    Button:
        font_size: 40
        text: 'Uno'
    Button:
        font_size: 40
        text: 'Dos'
    Button:
        font_size: 40
        text: 'Tres'  
    Button:
        font_size: 40
        text: 'Cuatro'
    Button:
        font_size: 40
        text: 'Cinco'
    Button:
        font_size: 40
        text: 'Seis'
''')
class Grid(GridLayout):
    pass

class DemoApp(App):
    def build(self):
        return Grid()

if __name__ == '__main__':
    DemoApp().run()
