def power(self):
    '[summary]\n\n        Returns:\n            [type]: [description]\n        '
    return (self.sXX / self.sXX_N)
[summary]

Returns:
    [type]: [description]
def power(self):
    '[summary]\n\n        Returns:\n            [type]: [description]\n        '
    return (self.sXX / self.sXX_N)