File: header_app_title.py

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textual 2.1.2-1.1
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from textual.app import App, ComposeResult
from textual.widgets import Header


class HeaderApp(App):
    def compose(self) -> ComposeResult:
        yield Header()

    def on_mount(self) -> None:
        self.title = "Header Application"
        self.sub_title = "With title and sub-title"


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