def handle(self):
        raise NotImplementedError()
Returns the value at a given position/slice. It raises IndexError if the position is invalid,
dataset/ETHPy150Open sdispater/cleo/cleo/commands/command.py/Command.handle--crossover with--dataset/ETHPy150Open gbeced/pyalgotrade/pyalgotrade/dataseries/__init__.py/DataSeries.__getitem__