code: def to_unit_distance(self, distance):
          
          if isinstance(distance, collections.Iterable):
              return [(x / self._distance_to_motor) for x in distance]
          else:
              return distance / self._distance_to_motor
docs: Convert distance/s to units of UnitConverter.
  
          Converts distance/s from motor encoder counts to that of this
          UnitConverter.
  
          Parameters
          ----------
          distance : int, float, or iterable of ints and floats
              The distance/s to convert.
  
          Returns
          -------
          converted_distance : float or list of floats
              The converted distance/s.