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Native python GUI library is tkinter.
no installation needed, gui elements aren't visually appealing.
3rd party libraries that you have to install: GTK, Wx widgets, QT. gui elements can blend with the underlying OS in some cases and generally look less outdated yhan tkinter.
I'm sure there are more I'm not aware of.
Last resource: design your own gui with pygame.
Button, switches, radio buttons. For simple interfaces is not very difficoult.