def list_deriv_vars(self):
        outs = []
        ins = []
        for comp in self._comps:
            ins.append('%s.X'%comp.name)
            ins.append('%s.R'%comp.name)
            if isinstance(comp, Shell):
                ins.append(comp.name%'%s.thickness')

        return ins, outs
dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.lib/src/openmdao/lib/geometry/stl_group.py/STLGroup.list_deriv_vars/swapped operands of `%`