def my_coroutine():
    while True:
        received = yield
        print('Received:', received)
        if received == 'Third':
            return 3


def second_coroutine():
    a = yield from my_coroutine()
    yield a

it = my_coroutine()
next(it)
it.send('First')
it.send('Second')
try:
    v = it.send('Third')
except StopIteration as e:
    print('StopIteration, returned value:', e.value)

it2 = second_coroutine()
next(it2)
it2.send('First')
it2.send('Second')
v2 = it2.send('Third')
print('value of yield from:', v2)


>>>
Received: First
Received: Second
Received: Third
StopIteration, return value: 3
Received: First
Received: Second
Received: Third
value of yield from: 3