def attach_disk(self, host_device, guest_device):
        run_process(["virsh", "-c", self.url, "attach-disk",
                    self.instance_id,
                    host_device, guest_device])
If the given string contains an expression, create an ExprEvaluator
dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/agents/functional/test_cinder.py/VirtIOClient.attach_disk--crossover with--dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.main/src/openmdao/main/case.py/Case._register_expr