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 open_pager(self):
        "Open the selected item with the system's pager"
        data = self.get_selected_item()
        if data['type'] == 'Submission':
            text = '\n\n'.join((data['permalink'], data['text']))
            self.term.open_pager(text)
        elif data['type'] == 'Comment':
            text = '\n\n'.join((data['permalink'], data['body']))
            self.term.open_pager(text)
        else:
            self.term.flash()