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For the record, here a simple and efficient roundrobin task
server based on collections.deque:

def roundrobin(*iterables):
    pending = deque(iter(i).next for i in iterables)
    gettask, scheduletask = pending.popleft, pending.append
    while pending:
        task = gettask()
        try:
            yield task()
        except StopIteration:
            continue
        scheduletask(task)

for value in roundrobin('abc', 'd', 'efgh'):
    print value