def diff(self, periods=1):
        result = algos.diff(_values_from_object(self), periods)
        return self._constructor(result, index=self.index).__finalize__(self)
Copies the request and environment object, but turning this request
dataset/ETHPy150Open pydata/pandas/pandas/core/series.py/Series.diff--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/webob-1.2.3/webob/request.py/BaseRequest.copy_get