Method sel

xarray/core/indexes.py:291–315

Query the index with arbitrary coordinate label indexers. Implementation is optional but required in order to support label-based selection. Otherwise it will raise an error when trying to call :py:meth:`Dataset.sel` with labels for this index coordinates. Coordinat

(self, labels: dict[Any, Any])

        return None

    def sel(self, labels: dict[Any, Any]) -> IndexSelResult:
        """Query the index with arbitrary coordinate label indexers.

        Implementation is optional but required in order to support label-based
        selection. Otherwise it will raise an error when trying to call
        :py:meth:`Dataset.sel` with labels for this index coordinates.

        Coordinate label indexers can be of many kinds, e.g., scalar, list,
        tuple, array-like, slice, :py:class:`Variable`, :py:class:`DataArray`, etc.
        It is the responsibility of the index to handle those indexers properly.

        Parameters
        ----------
        labels : dict
            A dictionary of coordinate label indexers passed from
            :py:meth:`Dataset.sel` and where the entries have been filtered
            for the current index.

        Returns
        -------
        sel_results : :py:class:`IndexSelResult`
            An index query result object that contains dimension positional indexers.
            It may also contain new indexes, coordinate variables, etc.
        """
        raise NotImplementedError(f"{self!r} doesn't support label-based selection")

    def join(self, other: Self, how: JoinOptions = "inner") -> Self:
        """Return a new index from the combination of this index with another