from kivy.app import App from kivy.uix.label import Label class MyApp(App): def build(self): label = Label(text='Hello, world!', height=50) return label MyApp().run()In this code example, we create a Label object with the text "Hello, world!" and a height of 50. This Label object is then returned by the `build` function and displayed in the Kivy user interface. Package library: Kivy, a Python package for creating multi-touch applications.