nodes: 0, module; 1, function_definition; 2, function_name:add; 3, parameters; 4, block; 5, identifier:self; 6, identifier:member; 7, identifier:score; 8, expression_statement; 9, return_statement; 10, comment:"""Add the specified member to the sorted set, or update the score
          if it already exist."""; 11, call; 12, attribute; 13, argument_list; 14, attribute; 15, identifier:zadd; 16, attribute; 17, identifier:member; 18, identifier:score; 19, identifier:self; 20, identifier:client; 21, identifier:self; 22, identifier:name
code: def add(self, member, score):
          """Add the specified member to the sorted set, or update the score
          if it already exist."""
          return self.client.zadd(self.name, member, score)