code: def zremrangebyscore(self, name, score_start, score_end):
                  
          score_start = get_integer_or_emptystring('score_start', score_start)
          score_end = get_integer_or_emptystring('score_end', score_end)
          return self.execute_command('zremrangebyscore', name, score_start,
                                      score_end)
docs: Delete the elements of the zset which have rank in the range
          [score_start,score_end].
          
          .. note:: The range is [``score_start``, ``score_end``]
  
          :param string name: the zset name
          :param int score_start: The minimum score related to keys(included),
           empty string ``''`` means -inf
          :param int score_end: The maximum score(included) related to keys,
           empty string ``''`` means +inf        
          :return: the number of deleted elements
          :rtype: int
          
          >>> ssdb.zremrangebyscore('zset_1', 20, 70)
          3
          >>> ssdb.zremrangebyscore('zset_1', 0, 100)
          6
          >>> ssdb.zremrangebyscore('zset_1', 2, 3)
          0