code: def parse(self, representation):
          
          elements = extract_tokens(representation)
  
          try:
              scales = [DurationRepresentation(float(p[0]), Scale(p[1])) for p in elements]
          except ValueError:
              raise ScaleFormatError("Malformed duration representation: {0}".format(representation))
  
          return scales
docs: Parses a duration string representation
  
  
          :param  representation: duration as a string, example: '1d' (day),
                                  '34minutes' (minutes), '485s' (seconds)...
          :type   representation: string
  
          :returns: the parsed duration representation
          :rtype: DurationRepresentation