File: actions01.py

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textual 2.1.2-1.1
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from textual.app import App
from textual import events


class ActionsApp(App):
    def action_set_background(self, color: str) -> None:
        self.screen.styles.background = color

    def on_key(self, event: events.Key) -> None:
        if event.key == "r":
            self.action_set_background("red")


if __name__ == "__main__":
    app = ActionsApp()
    app.run()