Shift values by desired number.

        Newly introduced missing values are filled with
        ``self.dtype.na_value``.

        .. versionadded:: 0.24.0

        Parameters
        ----------
        periods : int, default 1
            The number of periods to shift. Negative values are allowed
            for shifting backwards.

        fill_value : object, optional
            The scalar value to use for newly introduced missing values.
            The default is ``self.dtype.na_value``

            .. versionadded:: 0.24.0

        Returns
        -------
        shifted : ExtensionArray

        Notes
        -----
        If ``self`` is empty or ``periods`` is 0, a copy of ``self`` is
        returned.

        If ``periods > len(self)``, then an array of size
        len(self) is returned, with all values filled with
        ``self.dtype.na_value``.

def shift(
            self,
            periods: int = 1,
            fill_value: object = None,
    ) -> ABCExtensionArray:
        """
        Shift values by desired number.

        Newly introduced missing values are filled with
        ``self.dtype.na_value``.

        .. versionadded:: 0.24.0

        Parameters
        ----------
        periods : int, default 1
            The number of periods to shift. Negative values are allowed
            for shifting backwards.

        fill_value : object, optional
            The scalar value to use for newly introduced missing values.
            The default is ``self.dtype.na_value``

            .. versionadded:: 0.24.0

        Returns
        -------
        shifted : ExtensionArray

        Notes
        -----
        If ``self`` is empty or ``periods`` is 0, a copy of ``self`` is
        returned.

        If ``periods > len(self)``, then an array of size
        len(self) is returned, with all values filled with
        ``self.dtype.na_value``.
        """
        # Note: this implementation assumes that `self.dtype.na_value` can be
        # stored in an instance of your ExtensionArray with `self.dtype`.
        if not len(self) or periods == 0:
            return self.copy()

        if isna(fill_value):
            fill_value = self.dtype.na_value

        empty = self._from_sequence(
            [fill_value] * min(abs(periods), len(self)),
            dtype=self.dtype
        )
        if periods > 0:
            a = empty
            b = self[:-periods]
        else:
            a = self[abs(periods):]
            b = empty
        return self._concat_same_type([a, b])