How to use the jinja.nodes.TupleExpression function in Jinja

while True:
            if args:
                self.stream.expect('comma')
            if self.stream.current.type in tuple_edge_tokens:
                break
            args.append(parse())
            if self.stream.current.type == 'comma':
                is_tuple = True
            else:
                break
        if not is_tuple and args:
            if enforce:
                raise TemplateSyntaxError('tuple expected', lineno,
                                          self.filename)
            return args[0]
        return nodes.TupleExpression(args, lineno, self.filename)

else:
                raise TemplateSyntaxError('expected name or number',
                                          token.lineno, self.filename)
            self.stream.next()
        elif self.stream.current.type == 'lbracket':
            self.stream.next()
            args = []
            while self.stream.current.type != 'rbracket':
                if args:
                    self.stream.expect('comma')
                args.append(self.parse_subscribed_expression())
            self.stream.expect('rbracket')
            if len(args) == 1:
                arg = args[0]
            else:
                arg = nodes.TupleExpression(args, lineno, self.filename)
        else:
            raise TemplateSyntaxError('expected subscript expression',
                                      self.lineno, self.filename)
        return nodes.SubscriptExpression(node, arg, lineno, self.filename)