tallies.py

def accumulate():

    res = 0
    while True:
        t = yield
        if t == None:
            return res
        res += t

def tallies(ts):

    while True:
        t = yield from accumulate()
        ts.append(t)

def main():

    ts = []

    acc = tallies(ts)
    acc.send(None)

    for i in range(4):
        acc.send(i)

    acc.send(None)

    for i in range(5):
        acc.send(i)

    acc.send(None)
    print(ts)

What will it print?