def __getitem__(self, key):
        return self._get_item(key)[0]
A player that gets grumpier the more the opposition defects,
dataset/ETHPy150Open ntoll/p4p2p/p4p2p/dht/storage.py/DataStore.__getitem__--crossover with--dataset/ETHPy150Open Axelrod-Python/Axelrod/axelrod/strategies/grumpy.py/Grumpy.strategy