As we saw in Chapter 8, Improving the Look with Styles and Themes, Ttk provides a number of themes which differ from platform to platform. Each platform contains an alias called "default", which points to the most sensible theme for that platform.
Attempting to set a theme that doesn't exist results in an exception, so avoid hardcoding a theme setting in your application, and make sure theme choices are checked against the output of Style.theme_names() .
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