def getValue(self):
        ret = None
        if self.windowFull():
            values = self.getValues()
            lastValue = values[-1]
            mean = values.mean()
            std = values.std(ddof=self.__ddof)
            ret = float(std) / (lastValue - mean)
        return ret
dataset/ETHPy150Open gbeced/pyalgotrade/pyalgotrade/technical/stats.py/ZScoreEventWindow.getValue/swapped operands of `/`