def __eq__(self, other):
        return (isinstance(other, self.__class__) and
                other.package == self.package)
def test_impl(n):
            S1 = pd.Series(np.ones(n))
            S2 = pd.Series(np.random.ranf(n))
            df = pd.DataFrame({'A': S1, 'B': S2})
            return df.A.sum()