code: def by_date(self, chamber, date):
          "Return votes cast in a chamber on a single day"
          date = parse_date(date)
          return self.by_range(chamber, date, datef by_date(self, chamber, date):
          "Return votes cast in a chamber on a single day"
          date = parse_date(date)
          return self.by_range(chamber, date, date)
docs: Return votes cast in a chamber on a single day