def __init__(self, groups=None):
        super(GroupedRequirements, self).__init__(NamedRequirements)
        self.groups = groups or self.default_groups
        self.filename = None
        self.create_default_groups()
def test_impl(n):
            df = pd.DataFrame({'A': np.arange(0, n, 1, np.int32)})
            return df.A.quantile(.25)