code: def mac_address(self, mac_address):
          
  
          if not mac_address:
              # use the node UUID to generate a random MAC address
              self._mac_address = "52:%s:%s:%s:%s:00" % (self.project.id[-4:-2], self.project.id[-2:], self.id[-4:-2], self.id[-2:])
          else:
              self._mac_address = mac_address
  
          log.info('QEMU VM "{name}" [{id}]: MAC address changed to {mac_addr}'.format(name=self._name,
                                                                                       id=self._id,
                                                                                       mac_addr=self._mac_address))
docs: Sets the MAC address for this QEMU VM.
  
          :param mac_address: MAC address