You can learn more in the KV language guide.
Use the KV Language
00:00 Using the KV language. Kivy also provides a design language called KV that you can use with your Kivy applications. The KV language lets you separate your interface design from the application’s logic.
This line sets the
on_press event handler. To tell Kivy where the event handler is, you use
app.on_press_button(). Here, Kivy will look in the
Application class for a method called
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