In particular, PPL subroutines START (), RESET (), Info (), Symb (), Plot (), Num () and Setup counterparts of the last three can be implemented so that when those physical and soft buttons on the ...

I think the button staying pressed happens because of the modal tkFileDialog. There's probably a way to reset the appearance in __filebutton, but arguably keeping the button pressed is better than ...

Here’s a simple starter Python project for the Raspberry Pi. Press a button, and hear a random sound.