tornado

python部分笔记

眉间皱痕 提交于 2019-12-05 11:04:04
创建类和对象 图片转在自: https://www.cnblogs.com/aylin/p/5547558.html 图片转在自: https://www.cnblogs.com/aylin/p/5547558.html 图片转在自: https://www.cnblogs.com/aylin/p/5547558.html 接下来学习tornado http://shouce.jb51.net/tornado/ch1.html#ch1-1-1 //学习网址 我是直接用得pycharm装上就好 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 + ', friendly

Tornado Error Handling

六月ゝ 毕业季﹏ 提交于 2019-12-05 11:01:18
I want to be able to handle a nicer error that's displayed if i type an incorrect URL E.g. localhost:8000/AFDADSFDKFADS I get an ugly python traceback message because a tornado.web.HTTPError exception is thrown. I know I can use a regex to catch all scenarios other than my proper URLs however I figure there must be a way to handle this error within Tornado. I know that I can use the write_error() when extending the tornado.web.RequestHandler but because this error is happening in the tornado.web.Application class I don't know how to deal with it. I think it might have something to do with the

Cannot import Tornado submodules

故事扮演 提交于 2019-12-05 10:53:31
问题 Trying to install Tornado for first time (On EC2 Linux instance). I did pip install tornado and then tried running the hello world example: http://www.tornadoweb.org/en/stable/#hello-world import tornado.ioloop import tornado.web class MainHandler(tornado.web.RequestHandler): def get(self): self.write("Hello, world") application = tornado.web.Application([ (r"/", MainHandler), ]) if __name__ == "__main__": application.listen(80) tornado.ioloop.IOLoop.instance().start() I then try: python

How does 'yield' work in tornado when making an asynchronous call?

夙愿已清 提交于 2019-12-05 10:07:27
Recently, I was learning Introduction to Tornado , and I came across the following code: class IndexHandler(tornado.web.RequestHandler): @tornado.web.asynchronous @tornado.gen.engine def get(self): query = self.get_argument('q') client = tornado.httpclient.AsyncHTTPClient() response = yield tornado.gen.Task(client.fetch, "http://search.twitter.com/search.json?" + \ urllib.urlencode({"q": query, "result_type": "recent", "rpp": 100})) body = json.loads(response.body) [...omitted the following code...] I used to learn that yield is the key word turning a common function into a generator, and when

部署 flask 应用到 nginx 和 tornado

流过昼夜 提交于 2019-12-05 08:59:25
在网上搜索了一下部署flask应用的方法,大部分是用uwsgi部署在nginx上面,部署了很久,都没有成功,可能是我领悟能力太差,不过服务器上面的环境也够乱的有python2,python3,最后实在折腾得不行了,将uwsgi换成tornado,非常简单就搞定了,记录一下步骤,供以后参考: 软件怎么安装就不必说了,说说几个关键的地方: 1。Flask的入口程序为run.py,代码如下: #coding=utf-8 #!/usr/bin/python from somewhere import app #somewhere 表示的包含Flask的实例,如app = Flask(__name__) if __name__ == "__main__": app.run(debug=True) 2。在run.py的同级目录添加tornado应用程序tornado_server.py来托管run.py,代码如下: #coding=utf-8 #!/usr/bin/python from tornado.wsgi import WSGIContainer from tornado.httpserver import HTTPServer from tornado.ioloop import IOLoop from run import app http_server = HTTPServer

SignalR Alternative for Python

本小妞迷上赌 提交于 2019-12-05 08:38:38
What would be an alternative for SignalR in Python world? To be precise, I am using tornado with python 2.7.6 on Windows 8; and I found sockjs-tornado (Python noob; sorry for any inconveniences). But sockjs supports just 3 types of events and there are some limitations ; I need things like groups, subscribers, propagating and other features that SignalR provides. You are probably looking for Twisted, a whole real-time engine for applications. https://twistedmatrix.com/trac/ If you do microframeworks, Flask (think Sinatra on ruby) also has a real-time module, but it's all barebones really, it

How to wrap python daemon around my code

拥有回忆 提交于 2019-12-05 07:30:28
问题 I have a working server using Tornado now, according to the answer here: Python BaseHTTPServer and Tornado I'd like to daemonize it. I have been reading over and over this daemon class example here, but I can't figure out how it wraps around my server code. Do I just put all the code from __main__ in the run() that I override? How do I subclass it also if it's in another file? Make sure it's in the same directory and using it's filename without .py extension to import? I'm just looking for

Disable template processing in Tornadoweb

我与影子孤独终老i 提交于 2019-12-05 06:03:06
I have to use Tornadoweb as RESTfull backend for our existing AngularJs application. The {{}} are heavily used in the angular app. I would like to serve angular files from tornado as static files Is there a way to disable processing templates by tornado to avoid conflicts with {{}} used by tornado? I know how to change the {{}} in the angular app with $interpolateProvider but it will involve a lot of changes in the angular app. As a temporary solution, I put the angular app in the static folder of tornado and used a redirect: class IndexHandler(RequestHandler): def get(self): self.redirect

Does initialize in tornado.web.RequestHandler get called every time for a request/

Deadly 提交于 2019-12-05 05:43:33
问题 There'a an initialize method in tornado.web.RequestHandler class, is it called every time there's a request? 回答1: Yes, tornado calls initialize for each request. If you want to share state between requests(like db connection) - store it in self.application . 来源: https://stackoverflow.com/questions/15199028/does-initialize-in-tornado-web-requesthandler-get-called-every-time-for-a-reques

supervisord environment variables setting up application

泄露秘密 提交于 2019-12-05 05:32:20
I'm running an application from supervisord and I have to set up an environment for it. There are about 30 environment variables that need to be set. I've tried putting all on one big environment= line and that doesn't seem to work. I've also tried multiple enviroment= lines, and that doesn't seem to work either. I've also tried both with and without ' around the env value. What's the best way to set up my environment such that it remains intact under supervisord control? Should I be calling my actual program (tornado, fwiw) from a shell script with the environment preloaded there? Ideally, I