import microbit
# code based on page 54
# https://media.readthedocs.org/pdf/microbit-micropython/latest/microbit-micropython.pdf
while True:
    if microbit.button_a.is_pressed() and microbit.button_b.is_pressed():
        microbit.display.scroll("AB")
    elif microbit.button_a.is_pressed():
        microbit.display.scroll("A")
    elif microbit.button_b.is_pressed():
        microbit.display.scroll("B")
    microbit.sleep(100)