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_ccode_Piecewise():
    p = ccode(Piecewise((x, x < 1), (x**2, True)))
    s = \