queue = []

def make_producer():
    while True:
        queue.append(1)
        print(queue)
        yield consumer

def make_consumer():
    while True:
        if queue:
            queue.remove(1)
        print(queue)
        yield producer

producer = make_producer()
consumer = make_consumer()
working_gen = producer

count = 0
while True:
    working_gen = next(working_gen)

    count += 1
    if count > 20: break