code pas pour le groupe du milieu

import music
import radio
from microbit import *
radio.on()
radio.config(channel=14,power=7)
alerte=False
nb=0

while True:
    if button_a.was_pressed():
        radio.send('ALERTE-0')
        alerte=True
    if button_b.was_pressed():
        radio.send('STOP-0')
        alerte=False
    message=radio.receive()
    if message is not None:
        message2=message[:-2]
        nb=int(message[-1])
        if message2.lower() is 'stop' and alerte is True and nb<=9:
            radio.send('STOP-'+str(nb+1))
            alerte=False
        elif message2.lower() is 'alerte' and alerte is False and nb<=9:
            radio.send('ALERTE-'+str(nb+1))
            alerte=True
    if alerte is True:
        music.pitch(3150)
        
    else:
        music.stop()