This makes the user code easier to read:
brick.buttons()
brick.buttons.pressed()
It also opens up possibility to add features in the future such as:
brick.buttons.released() # return which buttons are not pressed
brick.buttons.clicked() # return which buttons were clicked since we last checked
This follows the same style as the new light API: some devices have specific instances of a KeyPad class.
A good example that nicely demonstrates the concept is the LPF2 RemoteControl, which has instances of a ColorLight and a KeyPad. It's added in this commit.
Laurens Valk