А вот и наглядное использование контроля стилей через свойства виджета. Билиотека qt-material.
В этом разделе написано, что через свойство class можно контролировать цвет кнопки, по аналогии с css стилями.
btn_danger.setProperty('class', 'danger')
btn_warning.setProperty('class', 'warning')
btn_success.setProperty('class', 'success')
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