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from time import sleep

def countdown_gen(n, consumer):

consumer.send(None)

while n > 0:

consumer.send(n)

n -= 1

consumer.send(None)

def countdown_con():

while True:

n = yield

if n:

print(f'Countdown {n}')

sleep(1)

else:

print('Countdown Over!')

def main():

countdown_gen(5, countdown_con())

if __name__ == '__main__':

main()