Change Qt Stylesheet for all Instances of a Widget

Question

Using PyQt, is there any way to change the stylesheet for every instance of a widget without having to manually change each widget's stylesheet.

Say, for instance, I wanted every pushbutton in my application to have red text. How would I do this without having to run button.setStyleSheet() for each button? Could there possibly be a way to change PyQt's stock button class?

Any help would be appreciated :)