Method shift

pandas/core/internals/managers.py:546–550

(self, periods: int, fill_value)

        return self.apply("pad_or_backfill", inplace=inplace, **kwargs)

    def shift(self, periods: int, fill_value) -> Self:
        if fill_value is lib.no_default:
            fill_value = None

        return self.apply("shift", periods=periods, fill_value=fill_value)

    def setitem(self, indexer, value) -> Self:
        """