def add(self, elem, replace=False):
        """Add a requirement.

        :param elem: a string or :class:`Requirement` instance.
        :param replace: if `True`, packages in the set with the same name will
            be removed first.
        """
        if isinstance(elem, text_type):
            elem = Requirement.coerce(elem)
        if replace and elem in self:
            self.remove(elem)
        super(Requirements, self).add(elem)
def test_ccode_constants_other():
    assert ccode(2*GoldenRatio) == "double const GoldenRatio = 1.61803398874989;\n2*GoldenRatio"
    assert ccode(
        2*Catalan) == "double const Catalan = 0.915965594177219;\n2*Catalan"
    assert ccode(2*EulerGamma) == "double const EulerGamma = 0.577215664901533;\n2*EulerGamma"