def adata():
    adata = ad.AnnData(np.zeros((100, 100)))
    adata.obsm["o"] = np.zeros((100, 50))
    adata.varm["o"] = np.zeros((100, 50))
    return adata
def test_cannot_write_none_identifier(self):
        with self.assertRaises(TypeError):
            _ = cypher_escape(None)