docs: def to_motor_distance(self, distance):
          """ Convert distance/s to motor units.
  
          Converts distance/s to units of motor encoder counts, which is
          what the drive requires when given move instructions.
  
          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.
  
          """
          if isinstance(distance, collections.Iterable):
              return [(x * self._distance_to_motor) for x in distance]
          else:
              return distance * self._distance_to_motor