Code micro:bit

from microbit import *
while True:
    if button_a.is_pressed():
        display.show(Image.HAPPY)
    elif button_b.is_pressed():
        display.show(Image.SAD)
    else:
        display.clear()
display.clear()

from microbit import *
while True:
    display.scroll("Happy",delay=500,loop=False,wait=True)
    display.show(Image.HAPPY)
    sleep(2000)