docs: def hrlist(self, name_start, name_end, limit=10):
          """
          Return a list of the top ``limit`` hash's name between ``name_start`` and
          ``name_end`` in descending order
  
          .. note:: The range is (``name_start``, ``name_end``]. The ``name_start``
             isn't in the range, but ``name_end`` is.
  
          :param string name_start: The lower bound(not included) of hash names to
           be returned, empty string ``''`` means +inf
          :param string name_end: The upper bound(included) of hash names to be
           returned, empty string ``''`` means -inf
          :param int limit: number of elements will be returned.
          :return: a list of hash's name
          :rtype: list
          
          >>> ssdb.hrlist('hash_ ', 'hash_z', 10)
          ['hash_2', 'hash_1']
          >>> ssdb.hrlist('hash_ ', '', 3)
          ['hash_2', 'hash_1']
          >>> ssdb.hrlist('', 'aaa_not_exist', 10)
          []
          """                
          limit = get_positive_integer('limit', limit)
          return self.execute_command('hrlist', name_start, name_end, limit)