安装tornado应该是成功的，看以下命令：

root@zzzz:~# python3
Python 3.5.2 (default, Sep 10 2016, 08:21:44)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import tornado
>>> exit()
root@zzzz:~# cd wwwroot
root@zzzz:~/wwwroot# python3 index.py

终端挂起，之后在浏览器中输入http://127.0.0.1:1234，结果是无法连接。index.py是网上找的一段代码，如下:

#! /usr/bin/python3.5
# -*- coding:utf-8 -*-

import tornado.httpserver
import tornado.ioloop
import tornado.options
import tornado.web

from tornado.options import define, options
define("port", default=8000, help="run on the given port", type=int)

class IndexHandler(tornado.web.RequestHandler):
def get(self):
greeting = self.get_argument('greeting', 'Hello')
self.write(greeting + ', tornado!')

if __name__ == "__main__":
tornado.options.parse_command_line()
app = tornado.web.Application(handlers=[(r"/", IndexHandler)])
http_server = tornado.httpserver.HTTPServer(app)
http_server.listen(options.port)
tornado.ioloop.IOLoop.instance().start()

要用默认端口才行，http://127.0.0.1:8000测试成功，自己搞定了。