def test_invalid_scalar_index(adata, index):
    # https://github.com/theislab/anndata/issues/619
    with pytest.raises(IndexError, match=r".*index.* out of range\."):
        _ = adata[index]
def __init__(self, key, child_proxy):
        try:
            self._key = int(key)
        except ValueError:
            self._key = key
        self._child_proxy = child_proxy