尝试运行龙卷风main.py时出现语法错误

这是我的简单龙卷风项目main.py文件:

import os
import os.path
import tornado.ioloop
import tornado.web
import tornado.httpserver
import tornado.options
from tornado.options import options


class Index(tornado.web.RequestHandler):

    def get(self, *args, **kwargs):
        self.write('Hello')

url_patterns = {
    (r'/', Index),
}

if __name__ == "__main__":
    tornado.options.parse_command_line()
    app = tornado.web.Application(
        url_patterns,debug=True,
        cookie_secret="*****",
        xsrf_cookies= False,
        template_path=os.path.join(os.path.dirname(__file__), "templates"),
        static_path= os.path.join(os.path.dirname(__file__), "static"),

    )

    http_server = tornado.httpserver.HTTPServer(app)
    http_server.listen(8080)
    tornado.ioloop.IOLoop.instance().start()

当我想运行此文件时,一个错误显示:

File "main.py", line 16
    (r'/', Index),
                 ^
SyntaxError: invalid syntax

我想在centos 6和python 2.7.8上运行这个。这是我的错误图片:

我的项目有什么问题?