Rearrange index levels using input order.

        Parameters
        ----------
        dim_order : optional
            Mapping from names matching dimensions and values given
            by lists representing new level orders. Every given dimension
            must have a multi-index.
        inplace : bool, optional
            If True, modify the dataarray in-place. Otherwise, return a new
            DataArray object.
        **dim_order_kwargs: optional
            The keyword arguments form of ``dim_order``.
            One of dim_order or dim_order_kwargs must be provided.

        Returns
        -------
        obj : DataArray
            Another dataarray, with this dataarray's data but replaced
            coordinates.

def reorder_levels(self, dim_order=None, inplace=None,
                       **dim_order_kwargs):
        """Rearrange index levels using input order.

        Parameters
        ----------
        dim_order : optional
            Mapping from names matching dimensions and values given
            by lists representing new level orders. Every given dimension
            must have a multi-index.
        inplace : bool, optional
            If True, modify the dataarray in-place. Otherwise, return a new
            DataArray object.
        **dim_order_kwargs: optional
            The keyword arguments form of ``dim_order``.
            One of dim_order or dim_order_kwargs must be provided.

        Returns
        -------
        obj : DataArray
            Another dataarray, with this dataarray's data but replaced
            coordinates.
        """
        inplace = _check_inplace(inplace)
        dim_order = either_dict_or_kwargs(dim_order, dim_order_kwargs,
                                          'reorder_levels')
        replace_coords = {}
        for dim, order in dim_order.items():
            coord = self._coords[dim]
            index = coord.to_index()
            if not isinstance(index, pd.MultiIndex):
                raise ValueError("coordinate %r has no MultiIndex" % dim)
            replace_coords[dim] = IndexVariable(coord.dims,
                                                index.reorder_levels(order))
        coords = self._coords.copy()
        coords.update(replace_coords)
        if inplace:
            self._coords = coords
        else:
            return self._replace(coords=coords)