Because this module describes devices that can be built into a hub or other device.
Since this design is now explicitly shown in
the docs as well, we don't need to hide this
module in the package.
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