def _set_item(self, key, value):
        raise NotImplementedError('_set_item(key, value) to be implemented.')
process cmd line set "global" variables/parameters
dataset/ETHPy150Open ntoll/p4p2p/p4p2p/dht/storage.py/DataStore._set_item--crossover with--dataset/ETHPy150Open pydoit/doit/doit/doit_cmd.py/DoitMain.process_args