Tornado框架是一款由Facebook团队开源的高效率的轻量级的非阻塞式web框架，由python编写而成。框架内部的具体实现我暂时不去深究，咱们首选学习一下它的简单使用，爽一爽先。
0x1:tornado的安装
安装Tornado也简直不能再省事儿，一句话就可以搞定：
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| star-chen@starchen-vb:~$ pip install tornado
Collecting tornado
Downloading tornado-4.4.2.tar.gz (460kB)
100% |████████████████████████████████| 460kB 21kB/s
Collecting singledispatch (from tornado)
Downloading singledispatch-3.4.0.3-py2.py3-none-any.whl
Collecting certifi (from tornado)
Downloading certifi-2016.9.26-py2.py3-none-any.whl (377kB)
100% |████████████████████████████████| 378kB 37kB/s
Collecting backports_abc>=0.4 (from tornado)
Downloading backports_abc-0.5-py2.py3-none-any.whl
Collecting six (from singledispatch->tornado)
Downloading six-1.10.0-py2.py3-none-any.whl
Building wheels for collected packages: tornado
Running setup.py bdist_wheel for tornado ... done
Stored in directory: /home/star-chen/.cache/pip/wheels/b3/db/47/46e05d1ee3ecfba252fcab42f0a156dab0df0cddf99fa0827c
Successfully built tornado
Installing collected packages: six, singledispatch, certifi, backports-abc, tornado
Successfully installed backports-abc-0.5 certifi-2016.9.26 singledispatch-3.4.0.
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0x2:tornado的helloworld
话不多讲，直接上代码
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| import tornado.ioloop
import tornado.web
class MainHandler(tornado.web.RequestHandler):
def get(self):
self.write("hello world");
def HelloApp():
return tornado.web.Application([
(r"/",MainHandler),
])
if __name__ == "__main__":
app = HelloApp()
app.listen(8888)
tornado.ioloop.IOLoop.current().start()
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看起来还是十分简洁明了的，就这么几句代码，就包含了路由规则的创建、事件处理函数的绑定、服务器的监听开启。
0x3:代码运行
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| $curl localhost:8888
hello world
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用浏览器访问一下，可以看到浏览器上已经输出了“hello world”,说明咱们的tornado已经正常运行了。接下来继续学习怎么在tornado中取得用户提交的参数。