code: def read_pipette_model(self, mount) -> Optional[str]:
          '''
          Reads an attached pipette's MODEL
          The MODEL is a unique string for this model of pipette
  
          :param mount: string with value 'left' or 'right'
          :return model string, or None
          '''
          if self.simulating:
              res = None
          else:
              res = self._read_from_pipette(
                  GCODES['READ_INSTRUMENT_MODEL'], mount)
              if res and '_v' not in res:
                  # Backward compatibility for pipettes programmed with model
                  # strings that did not include the _v# designation
                  res = res + '_v1'
              elif res and '_v13' in res:
                  # Backward compatibility for pipettes programmed with model
                  # strings that did not include the "." to seperate version
                  # major and minor values
                  res = res.replace('_v13', '_v1.3')
  
          return ref read_pipette_model(self, mount) -> Optional[str]:
          '''
          Reads an attached pipette's MODEL
          The MODEL is a unique string for this model of pipette
  
          :param mount: string with value 'left' or 'right'
          :return model string, or None
          '''
          if self.simulating:
              res = None
          else:
              res = self._read_from_pipette(
                  GCODES['READ_INSTRUMENT_MODEL'], mount)
              if res and '_v' not in res:
                  # Backward compatibility for pipettes programmed with model
                  # strings that did not include the _v# designation
                  res = res + '_v1'
              elif res and '_v13' in res:
                  # Backward compatibility for pipettes programmed with model
                  # strings that did not include the "." to seperate version
                  # major and minor values
                  res = res.replace('_v13', '_v1.3')
  
          return res
docs: Reads an attached pipette's MODEL
          The MODEL is a unique string for this model of pipette
  
          :param mount: string with value 'left' or 'right'
          :return model string, or None