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_impl(df):
            B = df.A.str.split(',')
            df2 = pd.DataFrame({'B': B})
            return df2[df2.B.str.len() > 1]