How do I retrieve a key of device after creation?

[Akvinikym]

Hello,

Let's suppose I used script add_nic_to_vm.py to create a new NIC. How am I to retrieve the key of the newly created device in order to, for example, delete it later? Should I after successful creation search through all the VM's devices to find my new one, based on some other parameters, or there is an easier way?

Thanks.