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 test_impl(n):
            df = pd.DataFrame({'A': np.arange(0, n, 1, np.float32)})
            df.A[0:100] = np.nan
            df.A[200:331] = np.nan
            return df.A.quantile(.25)