@obj_base.remotable
    def save(self):
        updates = self.obj_get_changes()
        if updates in 'address':
            raise exception.ObjectActionError(action='save',
                                              reason='address is not mutable')
        db.fixed_ip_update(self._context, str(self.address), updates)
        self.obj_reset_changes()
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/objects/fixed_ip.py/FixedIP.save/swapped operands of `in`