def __init__(self):
        self.callback_queue = Queue()
        self._running = False
        self._async = None
        self._state_change = Semaphore()
        self._workers = []
returns concatenated string of all parameters in
dataset/ETHPy150Open python-zk/kazoo/kazoo/handlers/gevent.py/SequentialGeventHandler.__init__--crossover with--dataset/ETHPy150Open travishathaway/python-ach/ach/data_types.py/Header.get_row