def my_function():
    basic.show_arrow(ArrowNames.EAST)
touchbit.on(touchbit.TouchPad.RIGHT,
    touchbit.TouchEvent.PRESSED,
    my_function)

def my_function2():
    basic.show_arrow(ArrowNames.WEST)
touchbit.on(touchbit.TouchPad.LEFT,
    touchbit.TouchEvent.PRESSED,
    my_function2)

def on_forever():
    pass
basic.forever(on_forever)