code: def list_motors(name_pattern=Motor.SYSTEM_DEVICE_NAME_CONVENTION, **kwargs):
      
      class_path = abspath(Device.DEVICE_ROOT_PATH + '/' + Motor.SYSTEM_CLASS_NAME)
  
      return (Motor(name_pattern=name, name_exact=True)
              for name in list_device_names(class_path, name_pattern, **kwargs))
docs: This is a generator function that enumerates all tacho motors that match
      the provided arguments.
  
      Parameters:
          name_pattern: pattern that device name should match.
              For example, 'motor*'. Default value: '*'.
          keyword arguments: used for matching the corresponding device
              attributes. For example, driver_name='lego-ev3-l-motor', or
              address=['outB', 'outC']. When argument value
              is a list, then a match against any entry of the list is
              enough.