tornado

Why doesn't time.sleep run in parallel in a Tornado coroutine?

由 自古美人都是妖i 提交于 2019-12-18 07:04:37
问题 When I run this handler in a simple Tornado app and make two requests to it with curl , it doesn't run in parallel. It prints out "1 2 3 4 5 1 2 3 4 5", when I want it to print "1 1 2 2 3 3 4 4 5 5". class SleepHandler(RequestHandler): def get(self): for i in range(5): print(i) time.sleep(1) What am I doing wrong? 回答1: The reason for this is that time.sleep is a blocking function: it doesn’t allow control to return to the IOLoop so that other handlers can be run. Of course, time.sleep is

Tornado模板

由 ￡可爱￡侵袭症＋ 提交于 2019-12-18 06:12:03
--------------------静态文件-------------------- 1、static_path：通过向web.Application类的构造函数传递一个名为static_path的参数来告诉Tornado从文件系统的一个特定位置提供静态文件 app = tornado.web.Application( [(r'/', IndexHandler)], static_path=os.path.join(os.path.dirname(__file__), "statics"), ) 2、对于静态文件目录的命名，为了便于部署，建议使用static 可以通过 http://127.0.0.1/static/html/index.html 来访问。而且在index.html中引用的静态资源文件，我们给定的路径也符合/static/...的格式，故页面可以正常浏览。 3、StaticFileHandler：可以通过tornado.web.StaticFileHandler来自由映射静态文件与其访问路径url。 1、tornado.web.StaticFileHandler是tornado预置的用来提供静态资源文件的handler。 2、 import os current_path = os.path.dirname(__file__) app = tornado.web

Adding new handler to running python tornado server

由 删除回忆录丶 提交于 2019-12-18 05:13:08
问题 I'm new to python tornado server, and I were evaluating python tornado for my next project that has to work on real time environment. I've run a sample code from github with Web Socket implementation. this is the sample code snippet. app = web.Application([ (r'/', IndexHandler), (r'/ws', SocketHandler), (r'/api', ApiHandler), (r'/(favicon.ico)', web.StaticFileHandler, {'path': '../'}), (r'/(rest_api_example.png)', web.StaticFileHandler, {'path': './'}), ]) if __name__ == '__main__': app

how do I include quoted HTML in a Tornado Template?

由 有些话、适合烂在心里 提交于 2019-12-18 03:17:37
问题 I'm using Tornado Templates and one of my fields is a string that has HTML tags quoted in it, e.g. <p>Solar power</p> When I render it into the template, the tags are quoted verbatim instead of treated as tags. {{ quoted_html }} So it looks exactly as above with the p tag visible. In other templating systems, {{ = foo}} renders foo verbatim, but {{html foo}} treats the tags as tags. Is there the equivalent in Tornado Templates? 回答1: {% raw foo %} , in Tornado 2.0+. If you do that with a lot

Python Tornado - Asynchronous Request is blocking

由 烂漫一生 提交于 2019-12-18 02:50:12
问题 The request handlers are as follows: class TestHandler(tornado.web.RequestHandler): # localhost:8888/test @tornado.web.asynchronous def get(self): t = threading.Thread(target = self.newThread) t.start() def newThread(self): print "new thread called, sleeping" time.sleep(10) self.write("Awake after 10 seconds!") self.finish() class IndexHandler(tornado.web.RequestHandler): # localhost:8888/ def get(self): self.write("It is not blocked!") self.finish() When I GET localhost:8888/test , the page

Websockets with Tornado: Get access from the “outside” to send messages to clients

由 淺唱寂寞╮ 提交于 2019-12-17 22:38:03
问题 I'm starting to get into WebSockets as way to push data from a server to connected clients. Since I use python to program any kind of logic, I looked at Tornado so far. The snippet below shows the most basic example one can find everywhere on the Web: import tornado.httpserver import tornado.websocket import tornado.ioloop import tornado.web class WSHandler(tornado.websocket.WebSocketHandler): def open(self): print 'new connection' self.write_message("Hello World") def on_message(self,

在Jupyter Notebook中增加Python内核

由 北城以北 提交于 2019-12-17 21:35:26
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 本人在Python 3.6的环境下，安装了Jupyter pip3 install jupyter 进入到Jupyter Notebook后，点击Kernel菜单的Change kernel子菜单，只看到只有一个Python 3。如果这时想要增加Python 2的内核（Python 2.7），可通过以下方式操作 安装 ipykernel pip install ipykernel 在安装时，出现了报错 Complete output from command python setup.py egg_info: IPython 6.0+ does not support Python 2.6, 2.7, 3.0, 3.1, or 3.2. When using Python 2.7, please install IPython 5.x LTS Long Term Support version. Beginning with IPython 6.0, Python 3.3 and above is required. 也就是说最新版的 IPython 不支持 Python 2.7，这时可先单独安装ipython，并指定旧的版本号进行安装 pip install ipython==5.3.0 如果版本不存在的

Tornado Asynchronous Handler

由 ＊爱你＆永不变心＊ 提交于 2019-12-17 18:58:20
问题 I am attempting to implement get_current_user in the RequestHandler for Tornado, but I need the call to block while waiting on the asynchronous call to my database. Decorating the call with @tornado.web.asynchronous will not work because either way the get_current_user method returns before the async query completes and the query callback is executed. For example: class MyHandler(BaseHandler): @tornado.web.asynchronous @tornado.web.authenticated def get(self): self.write('example') self

Tornado celery integration hacks

由 血红的双手。 提交于 2019-12-17 17:48:33
问题 Since nobody provided a solution to this post plus the fact that I desperately need a workaround, here is my situation and some abstract solutions/ideas for debate. My stack: Tornado Celery MongoDB Redis RabbitMQ My problem: Find a way for Tornado to dispatch a celery task ( solved ) and then asynchronously gather the result ( any ideas? ). Scenario 1: (request/response hack plus webhook) Tornado receives a (user)request, then saves in local memory (or in Redis) a { jobID : (user)request} to

Python JSON encoder to support datetime?

由 喜你入骨 提交于 2019-12-17 16:18:30
问题 is there any elegant way to make Python JSON encoder support datetime? some 3rd party module or easy hack? I am using tornado's database wrapper to fetch some rows from db to generate a json. The query result includes a regular MySQL timestamp column. It's quite annoying that Python's default json encoder doesn't support its own datetime type, which is so common in all kinds of database queries. I don't want to modify Python's own json encoder. any good practice? Thanks a lot! ps: I found a
订阅 tornado