twisted

Force python to use an older version of module (than what I have installed now)

由 大兔子大兔子 提交于 2019-11-26 19:45:35
问题 My employer has a dedicated module 1 we use for internal unit / system test; however, the author of this module no longer works here and I have been asked to test some devices with it. The problem is that pyfoo requires an ancient version of twisted (v8.2.0) and it imports twisted in 33 different files. I tried running pyfoo 's unit tests under v11.0.0 and I don't even see TCP SYN packets 2 . Unfortunately, I have already got twisted v11.0.0 installed on my lab linux server and I have my own

Twisted: Making code non-blocking

由 最后都变了- 提交于 2019-11-26 19:38:00
问题 I'm a bit puzzled about how to write asynchronous code in python/twisted. Suppose (for arguments sake) I am exposing a function to the world that will take a number and return True/False if it is prime/non-prime, so it looks vaguely like this: def IsPrime(numberin): for n in range(2,numberin): if numberin % n == 0: return(False) return(True) (just to illustrate). Now lets say there is a webserver which needs to call IsPrime based on a submitted value. This will take a long time for large

Which Python async library would be best suited for my code? Asyncore? Twisted?

由 微笑、不失礼 提交于 2019-11-26 19:19:50
问题 I have a program I'm working on that will be reading from two 'network sources' simultaneously. I wanted to try out an asynchronous approach rather than use threading. This has lead me to wonder which library to use... I've come up with some simple example code that kind of demonstrates what my program will be doing: import sniffer def first(): for station in sniffer.sniff_wifi(): log(station.mac()) def second(): for station in sniffer.sniff_ethernet(): log(station.mac()) first() second() The

Python 四大主流 Web 编程框架

由 无人久伴 提交于 2019-11-26 19:19:37
Python 四大主流 Web 编程框架 目前Python的网络编程框架已经多达几十个，逐个学习它们显然不现实。但这些框架在系统架构和运行环境中有很多共通之处，本文带领读者学习基于Python网络框架开发的常用知识,及目前的4种主流Python网络框架：Django、Tornado、Flask、Twisted。 网络框架及MVC架构 所谓网络框架是指这样的一组Python包，它能够使开发者专注于网站应用业务逻辑的开发，而无须处理网络应用底层的协议、线程、进程等方面。这样能大大提高开发者的工作效率，同时提高网络应用程序的质量。 在目前Python语言的几十个开发框架中，几乎所有的全栈网络框架都强制或引导开发者使用MVC架构开发Web应用。所谓全栈网络框架，是指除了封装网络和线程操作，还提供HTTP栈、数据库读写管理、HTML模板引擎等一系列功能的网络框架。本文重点讲解的Django、Tornado和Flask是全栈网络框架的典型标杆；而Twisted更专注于网络底层的高性能封装而不提供HTML模板引擎等界面功能，所以不能称之为全栈框架。 MVC （Model-View-Controller）模式最早由Trygve Reenskaug在1978年提出，在20世纪80年代是程序语言Smalltalk的一种内部架构。后来MVC被其他语言所借鉴，成为了软件工程中的一种软件架构模式

Error on “pip install -U channels” command using for otree (Running setup.py bdist_wheel for twisted … error)

由 自古美人都是妖i 提交于 2019-11-26 18:36:31
问题 For a project using otree (http://otree.readthedocs.io/) I ran into some problems trying to install Channels in order to make use of real-time functionalities. Because of the long output I tried to figure out the most important parts: For full output see: https://jsfiddle.net/L4ccmr2k/1/ Red marked output & output considered relevant from my side: 1. Building wheels for collected packages: twisted Running setup.py bdist_wheel for twisted ... error 2. creating build/temp.macosx-10.6-intel-3.6

Python - Twisted, Proxy and modifying content

由 不问归期 提交于 2019-11-26 17:27:54
问题 So i've looked around at a few things involving writting an HTTP Proxy using python and the Twisted framework. Essentially, like some other questions, I'd like to be able to modify the data that will be sent back to the browser. That is, the browser requests a resource and the proxy will fetch it. Before the resource is returned to the browser, i'd like to be able to modify ANY (HTTP headers AND content) content. This ( Need help writing a twisted proxy ) was what I initially found. I tried

（转） Twisted ：第十八部分 Deferreds 全貌

由 好久不见. 提交于 2019-11-26 17:01:31
简介 在上一个部分,我们学习了使用生成器构造顺序异步回调的新方法.这样,包括 deferreds ,我们现在有两种将异步操作链接在一起的方法. 有时,然而,我们需要"并行"的运行一组异步操作.由于Twisted是单线程的,它实际并不会并发运行,但我们希望使用异步I/O在一组任务上尽可能快的工作.以我们的诗歌客户端为例,它从多个服务器同时下载诗歌,而不是一个接一个的方式.这就是使用Twisted下载诗歌的全部特点. 作为一个结果,所有诗歌客户端需要解决一个问题:你怎样得知你启动的所有异步操作已经完成?目前我们通过将结果集总到一个列表(如客户端 7.0中的 结果 列表)并检查这个列表的长度来解决这个问题.除了收集成功的结果,我们还必须小心地对待失败,否则一个失败将使程序进入死循环,以为还有工作需要做. 正如你所料,Twisted包含一个抽象层可以用来解决这个问题,我们来看一看. DeferredList DeferredList 类使我们可以将一个 defered 对象列表视为一个 defered 对象.通过这种方法我们启动一族异步操作并且在它们全部完成后获得通知(无论它们成功或者失败).让我们看一些例子. 在 deferred-list/deferred-list-1.py 中,可以找到如下代码: from twisted.internet import defer def got

The latest recommendation for Comet in Python? [closed]

由 别说谁变了你拦得住时间么 提交于 2019-11-26 15:26:25
问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . I'm going to be implementing Comet in Python (even though I hear good things about erlycomet I'm not thrilled about supporting an

解决django或者其他线程中调用scrapy报ReactorNotRestartable的错误

由 六眼飞鱼酱① 提交于 2019-11-26 12:15:33
官网中关于ReactorNotRestartable的错误描述（摘自： https://twistedmatrix.com/documents/16.1.0/api/twisted.internet.error.html ），我们将从scrapy源码分析这个问题 重点要了解scrapy源码下的crawler.py模块的三个类，这三个类是Scrapy的启动核心代码， 由于Scrapy是基于Twisted(一个python网络编程框架)的事件循环写的异步爬虫框架， 所以需要对Twisted模块有一定了解。这里不展开描写了。 Crawler类： 启动scrapy的爬虫引擎并开始爬取 CrawlerRunner类：是Crawler子类， 将设置传递给Crawler类并启动 CrawlerProcesser类： 是CrawlerRunner子类，启动并且控制Twisted的reactor参数，这个reactor参数是全局变量，有且只能有一个，且只能在主线程中运行 import six import signal import logging import warnings import sys from twisted.internet import reactor, defer from zope.interface.verify import verifyClass,

Persistent connection in twisted

由 那年仲夏 提交于 2019-11-26 11:39:57
问题 I\'m new in Twisted and have one question. How can I organize a persistent connection in Twisted? I have a queue and every second checks it. If have some - send on client. I can\'t find something better than call dataReceived every second. Here is the code of Protocol implementation: class SyncProtocol(protocol.Protocol): # ... some code here def dataReceived(self, data): if(self.orders_queue.has_new_orders()): for order in self.orders_queue: self.transport.write(str(order)) reactor.callLater
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