code: def by_range(self, chamber, start, end):
          
          check_chamber(chamber)
  
          start, end = parse_date(start), parse_date(end)
          if start > end:
              start, end = end, start
  
          path = "{chamber}/votes/{start:%Y-%m-%d}/{end:%Y-%m-%d}.json".format(
              chamber=chamber, start=start, end=end)
          return self.fetch(path, parse=lambda r: r['results'])
docs: Return votes cast in a chamber between two dates,
          up to one month apart.