Estou usando o Python 2.5 no Windows 7 (64 bits

Instalei o pycurl-7.15.5.1 (com binários win) e o tornado (usando pip

Quando executo o seguinte código hello world:

import tornado.ioloop
import tornado.web

class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello World!")

if __name__=='__main__':
    app = tornado.web.Application([(r"/",MainHandler),])
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

Estou tendo o erro a seguir:

Traceback (most recent call last):

  File "hello_tornado.py", line 11, in <module>
    application.listen(8888)
  File "c:\Python25\Lib\site-packages\tornado\web.py", line 1193, in listen
    server.listen(port, address)
  File "c:\Python25\Lib\site-packages\tornado\netutil.py", line 100, in listen
    sockets = bind_sockets(port, address=address)
  File "c:\Python25\Lib\site-packages\tornado\netutil.py", line 263, in bind_sockets
    sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 1)
  AttributeError: 'module' object has no attribute 'IPV6_V6ONLY'