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):
            df2 = df[['A']]
            df2['A'] += 10
            return df2.A, df.A