def _set_coord_sys(self, sys):
        if sys in _COORD_SYSTEMS:
            self._coordinate_system = sys
        else:
            raise ValueError('invalid coordinate system %r' % sys)
dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.lib/src/openmdao/lib/datatypes/domain/zone.py/Zone._set_coord_sys/original