code: def mac_addresses(self):
          
          mac_addresses = [self.findtext("general/mac_address")]
          if self.findtext("general/alt_mac_address"):
              mac_addresses.append(self.findtext("general/alt_mac_address"))
              return mac_addresses
docs: Return a list of mac addresses for this device.
  
          Computers don't tell you which network device is which.