Should_stop_when_button_B_held_and_song_ends

code.py

# sasa-chairs
# Note: This was demo code set up to show students how the debounced button press doesn't register until
# after the song plays. However for some reason I notice when run on a CPB using CircuitPython 9.2.4
# that the song runs a second time, even after the update() has run, the button_B is pressed, and 
# button_A: False, button_B: False prints <- not expected because my finger remains on button_B.
# Here is some sample output. I'm seeing that even after False / False, the sound play restarts & am unsure why.
# If I continue holding button_B through one more play, the sound stops, as expected, and button_B.value is True
# but I had expected this to occur earlier when I held B through the first complete sound play.
# If you'd like to test with my sound, it's in the sasa-chairs folder at:
# http://bit.ly/circuitpython-school-files
"""
button_A: True, button_B: False
Setting is_playing to True
About to play sound
Finished playing sound
button_A: False, button_B: False # button_B.value IS FALSE EVEN THOUGH MY FINGER IS DOWN ON button_B
About to play sound
Finished playing sound
button_A: False, button_B: True # I'VE KEPT MY FINGER ON BUTTON_B & IT'S FINALLY SEEN AS TRUE, BUT NOT 'TIL A SECOND PLAY
Button B detected - setting is_playing to False
button_A: False, button_B: False

"""

import board, digitalio
from adafruit_debouncer import Button
from audiopwmio import PWMAudioOut as AudioOut # for CPB & Pico
from audiocore import WaveFile # only needed for wav

# Debounced CPB Buttons
button_A_input = digitalio.DigitalInOut(board.BUTTON_A)
button_A_input.switch_to_input(digitalio.Pull.DOWN) # Note: Pull.UP for external buttons
button_A = Button(button_A_input, value_when_pressed = True) # NOTE: False for external buttons
button_B_input = digitalio.DigitalInOut(board.BUTTON_B)
button_B_input.switch_to_input(digitalio.Pull.DOWN) # Note: Pull.UP for external buttons
button_B = Button(button_B_input, value_when_pressed = True) # NOTE: False for external buttons

# set up the speaker
speaker = digitalio.DigitalInOut(board.SPEAKER_ENABLE)
speaker.direction = digitalio.Direction.OUTPUT
speaker.value = True
audio = AudioOut(board.SPEAKER)

# set path where sound files can be found CHANGE if different folder name
path = "sasa-chairs/"

# play_sound function - pass in the FULL NAME of file to play
def play_sound(filename):
    with open(path + filename, "rb") as wave_file:
        wave = WaveFile(wave_file)
        audio.play(wave)
        while audio.playing:
            pass

print("SASA Chairs running")

is_playing = False
while True:
    button_A.update()
    button_B.update()
    print(f"button_A: {button_A.pressed}, button_B: {button_B.pressed}")
    if button_A.pressed:
        print("Setting is_playing to True")
        is_playing = True
    if button_B.pressed:
        print("Button B detected - setting is_playing to False")
        is_playing = False
    if is_playing:
        print("About to play sound")
        play_sound("musical-chairs.wav")
        print("Finished playing sound")

Updated the print & explanation.