Method __getitem__

xarray/core/variable.py:815–835

Return a new Variable object whose contents are consistent with getting the provided key from the underlying data. NB. __getitem__ and __setitem__ implement xarray-style indexing, where if keys are unlabeled arrays, we index the array orthogonally with them. If keys

(self, key)

        return out_dims, VectorizedIndexer(tuple(out_key)), new_order

    def __getitem__(self, key) -> Self:
        """Return a new Variable object whose contents are consistent with
        getting the provided key from the underlying data.

        NB. __getitem__ and __setitem__ implement xarray-style indexing,
        where if keys are unlabeled arrays, we index the array orthogonally
        with them. If keys are labeled array (such as Variables), they are
        broadcasted with our usual scheme and then the array is indexed with
        the broadcasted key, like numpy's fancy indexing.

        If you really want to do indexing like `x[x > 0]`, manipulate the numpy
        array `x.values` directly.
        """
        dims, indexer, new_order = self._broadcast_indexes(key)
        indexable = as_indexable(self._data)

        data = indexing.apply_indexer(indexable, indexer)

        if new_order:
            data = duck_array_ops.moveaxis(data, range(len(new_order)), new_order)
        return self._finalize_indexing_result(dims, data)

    def _finalize_indexing_result(self, dims, data) -> Self:
        """Used by IndexVariable to return IndexVariable objects when possible."""