def keys(self):
        raise NotImplementedError('keys() method needs implementing.')
This is invoked when this object is added to the mayavi
dataset/ETHPy150Open ntoll/p4p2p/p4p2p/dht/storage.py/DataStore.keys--crossover with--dataset/ETHPy150Open enthought/mayavi/mayavi/core/source.py/Source.start