docs

docs/examples/messages_and_events/beep.py

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+from textual.app import App
+
+
+class Beeper(App):
+    async def on_key(self, event):
+        self.console.bell()
+
+
+Beeper.run()

docs/examples/messages_and_events/beep_typed.py

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+from textual.app import App
+from textual import events
+
+
+class Beeper(App):
+    async def on_key(self, event: events.Key) -> None:
+        self.console.bell()
+
+
+Beeper.run()

docs/examples/messages_and_events/color_changer.py

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+from textual.app import App
+
+
+class ColorChanger(App):
+    async def on_key(self, event):
+        if event.key.isdigit():
+            self.background = f"on color({event.key})"
+
+
+ColorChanger.run()