test_groupby.py 文件源码

def test_groupby_categorical_unequal_len(self):
        # GH3011
        series = Series([np.nan, np.nan, 1, 1, 2, 2, 3, 3, 4, 4])
        # The raises only happens with categorical, not with series of types
        # category
        bins = pd.cut(series.dropna().values, 4)

        # len(bins) != len(series) here
        self.assertRaises(ValueError, lambda: series.groupby(bins).mean())