Simple CoRoutine Example for QA parsing

s = """

Q: What is a good way of achieving this?

A: I am not sure. Try the following:

1. Take this first step. Execute everything.

2. Then, do the second step

3. And finally, do the last one

Q: What is another way of achieving this?

A: I am not sure. Try the following alternatives:

1. Take this first step from before. Execute everything.

2. Then, don't do the second step

3. Do the last one and then execute the above step

"""

def CoRoutine(cr):
    def Wrapper(*args, **kwargs):
        result = cr(*args, **kwargs)
        next(result)
        return result
    return Wrapper

@CoRoutine
def QA(out):
  def Send(question, answer_arr):
    out.send((question, '\n'.join(answer_arr)))

question = None
  while True:
    while True:
      try:
        line = (yield)
      except GeneratorExit:
        Send(question, answer_so_far)
        raise
      moar_answer, is_question, next_question = line.partition(' Q: ')
      if is_question:
        if question:
          Send(question, answer_so_far)
        question = next_question
        break
      elif question:
        answer_so_far.append(moar_answer)

while True:
      line = (yield)
      _, is_answer, answer = line.partition(' A: ')
      if is_answer:
        break

answer_so_far = [answer]

@CoRoutine
def Printer():
  while True:
    stuff = (yield)
    print stuff

out = Printer()
qa = QA(out)

for line in s.split('\n'):
  qa.send(line)

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