def constraints(self, first, second):
        """ A constraint of the form: (second - first) <= size

        A second constraint is applied to prevent negative space:
        (second - first) >= 0

        """
        return [(second - first) <= self.size, (second - first) >= 0]
dataset/ETHPy150Open nucleic/enaml/enaml/layout/spacers.py/LeSpacer.constraints/original