from multiprocessing import Pool

def wrap_worker(passthru):
    return passthru.worker()

class Result(object):
    def __init__(self, something):
        self.something = something

class Thing(object):
    Result = Result

    def worker(self):
        return self.Result(1)

    def master(self, pool):
        async_result = pool.apply_async(wrap_worker, args=(self,))
        return async_result

class DerivedThing(Thing):
    pass


if __name__ == '__main__':
    pool = Pool(4)
    dt = DerivedThing()
    async_result = dt.master(pool)
    result = async_result.get()
    pool.close()
    print result, result.something