def get_constraint(self, twig=None, **kwargs):
        """
        Filter in the 'constraint' context

        :parameter str constraint: name of the constraint (optional)
        :parameter **kwargs: any other tags to do the filter
            (except constraint or context)
        :return: :class:`phoebe.parameters.parameters.ParameterSet`
        """
        if twig is not None:
            kwargs['twig'] = twig
        kwargs['context'] = 'constraint'
        return self.get(**kwargs)
Filter in the 'constraint' context

        :parameter str constraint: name of the constraint (optional)
        :parameter **kwargs: any other tags to do the filter
            (except constraint or context)
        :return: :class:`phoebe.parameters.parameters.ParameterSet`