code: def get_device(self, addr_or_name):
          
          if addr_or_name in self._devices:
              return self._devices[addr_or_name]
  
          for v in self._devices.values():
              if v == addr_or_name:
                  return v
  
          return None
docs: Retrieve a device with a given address or name from the results.
          
          Args:
              addr_or_name (str): a string containing either a BLE address in xx:xx:xx:xx:xx:xx
                  format, or a plain device name. The supplied value is checked as an address
                  first and if that fails to produce a result, it is matched against each
                  named device in the collection. 
  
          Returns:
              The first matching :class:`ScanResult` instance, or None.