lightweight m2m

Nsuserdefaults is suitable for storing lightweight local data, such as the data to save a login interface, user name, password, and so on, individuals feel that using nsuserdefaults is preferred. The next time you log in, you can read the last login information directly from the Nsuserdefaults.Because if you use the Plist file you created, you also have to display the creation of files, read files, very troublesome, but with nsuserdefaults do not care

Python Development Lightweight Crawler (IMOOC summary 05--Web Downloader)介绍网页下载器 网页下载器是将互联网上url对应的网页下载到本地的工具。因为将网页下载到本地才能进行后续的分析处理，可以说网页下载器是爬虫的核心组件。 网页下载器类似于网页浏览器，会将url对应的互联网网页，以HTML的形式下载到本地存储一个本地文件或者本地字符串，然后才能进行后续的分析和处理。Python有哪几种网页下载器呢？ Urllib2 – python官方的基础模块，它支持直接的url下载， 或者说向网页提交一些需要用户输入的数据，甚至支持需要登陆网页的cookie处理，需要代理访问的代理处理等这些增强功能。 Request – python第三方的插件，它提供更为强大的功能。 这里选用urllib2这个简单的模块来实现网页的下载。网页下载器---urllib2 第一种：最简洁的方法

Python Development Lightweight Crawler (IMOOC summary 08--Crawler example-analysis target)How to develop a crawler? What are the steps involved in developing a crawler?1.确定要抓取得目标，即抓取哪些网站的哪些网页的哪部分数据。本实例确定抓取Python百度百科词条页面以及相关词条页面的标题和简介。2.分析这个目标，即需要确定抓取这些网站数据的策略。有三部分需要分析。1）需要分析这些目标页面的url格式，用来限定我们要抓取页面的范围。 如果这个范围不进行限定的话，我们的爬虫就会抓取互联网上很多不相关的网页，造成资源的浪费。2）我们需要分析要抓取得数据格式。 在本实例中就要分析，每一个词条页面中标题和简介。这两个数据在标签中的格式。3）分析页面的编码。 在我们代码的解析器这部分，需要指定网页的编码，才能够正确的解析。

Python Development Lightweight Crawler (IMOOC summary 04--url Manager)介绍抓取URL管理器 url管理器用来管理待抓取url集合和已抓取url集合。这里有一个问题，遇到一个url，我们就抓取它的内容，为什么还要对url进行管理呢？ 是为了防止重复抓取、防止循环抓取。我们都知道，每一个网页都有很多指向其它网页的url，其它网页的url也会指向本网页。这样不同url之间就存在一种循环指向的问题。如果不对这些url进行管理，那么我们的爬虫就在循环不断抓取这两个url，形成一个死循环。重复抓取、循环抓取是我们要避免的情况。所以我们使用url管理器对它们进行统一的管理。The URL manager needs to support these features: 首先需要支持 将一个新url添加到待爬取集合中，在添加的同时，需要判断待添加url是不是在容器中已经存在。如果是的话，就不能添加，以防止重复抓取。同时，我们需要支持

Python Development Lightweight Crawler (IMOOC summary 02--crawler introduction)爬虫简介首先爬虫是什么？它是一段自动抓取互联网信息的程序。什么意思呢？ 互联网由各种各样的的网页组成，每一个网页都有对应的url，而url页面上又有很多指向其它页面的url，这些url之间相互指向的关系，就形成了一个网状，这就是互联网。 正常情况下，我们使用人工的方式，从互联网上获取我们需要的感兴趣的信息。那有没有一种方法，我们设定了一个主题，设定一个感兴趣的目标，可以自动从互联网上获取我们所需要的数据呢?这就是爬虫。爬虫就是从一个url出发，访问它所关联的所有url,并且从每个页面上提取出我们所需要的价值数据。也就是说，爬虫就是自动访问互联网并且提取数据的程序。爬虫价值爬虫这门技术有什么价值呢？那就是互联网数据为我所用！如果我们已经从互联网上爬取了各种各样的数据并且存储了下来，那么我们就可以更方便的学习，也可以对这些数据进行更多

iOS provides a lightweight, fast data storage method: Nsuserdefaults;When the program runs, it reads the program settings from the user's default database, while the nsuserdefaults cache avoids opening the user's default database every time the data is read, all the data is in memory, and read and write is fast.Nsuserdefaults is a singleton, in the whole program only one instance object, he can be used for the permanent preservation of data, and simpl

With the impact of the mobile Internet on the traditional Internet, user groups pay more attention to the timeliness of information and the effectiveness of simple sharing and access, the traditional community model after years of accumulation of deep, especially for the emerging community user groups and webmasters, if the need to challenge the already very mature community groups is still more difficult, And not enough energy to run. On the contrary, in the popular community at home and abroad

Recently chatting with colleagues, learned that they are using a WebService implementation method called Hessian to implement a remote method call, is lightweight, does not rely on Java EE container, but also the binary data format transmission, efficiency than the XML method of soap is higher. Feel like a restful way, curious to access the relevant information online, summarized as follows:First, IntroductionHessian is a remote communication library

Simple and lightweight blog platform: Hexo detailsWhat is Hexo? Hexo is a simple, lightweight, Node-Based Static blog framework that allows you to easily generate static Web pages hosted on github and Heroku. Reference The Hexo author @ tommy351: A fast, simple, and powerful Node. js blog framework.A fast, simple powerful blog framework, powered by Node. js. What is GitHub Pages? GitHub Pages can be

Netty-based lightweight high-performance distributed RPC service framework forest Netty-based lightweight high-performance distributed RPC service framework forest The article has briefly introduced the Quick Start of forest. This article aims to introduce the forest user guide.Basic Introduction Forest is a java-based RPC framework. In addition to conventional point-to-point calls, Motan also provides se

Java lightweight IOC framework GuiceGuice is an absolutely lightweight java IoC container developed by Google Daniel Bob lee. Its advantage is: the speed is 100 times faster than spring. There is no external configuration (you can use the Guice extension package if you need to use external resources). It is completely based on the annotation Feature and supports refactoring and static code check. Simple, fa

Quo JS is a lightweight, modular, object-oriented JavaScript library that defines a variety of touch gestures that can be used to simplify HTML file traversal, event handling, and Ajax interactions in mobile web development, making it easy for developers to write efficient cross-browser code.Quo JS IntroductionQuo JS is designed to simplify the amount of code for your mobile development projects, optimize code for your current mobile device, and suppo

Preface to the Java web lightweight development interview course, This article is an excerpt from the java web lightweight development interview tutorial. Why choose this one from many Java books? Why do I need to buy this book when the amount of information on the Internet is so large, instead of reading network materials? I have already developed Java Web programs. Is it necessary to buy this book? I have

# noframe----------------------------------- Noframe defines a set of efficient, prescriptive, lightweight PHP development specifications. Noframe uses entrance.php instead of index.php as the single entry file for the application. At the same time entrance.php as the only file for noframe, you can change it to your favorite name. The noframe provides two routing modes, path_info mode and compatibility mode. Path_info requires support for the serve

Article Title: lightweight LINUX: use old hardware to break the software and hardware upgrade cycle. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. 　　 Policies and Suggestions I plan to use this laptop for writing and remote access to my more powerful desktop development system. Therefore, I need the system to hav

Jqmeter is a simple and practical lightweight progress bar jquery plugin, it can be displayed as a horizontal or vertical progress bar, the progress bar is loaded with animated effects, you just need to pass some parameters into the Jqmeter object's constructor to complete the desired progress bar effect.The progress bar Plugin's constructor allows you to define the width, height, background color, progress bar color, and so on for the progress bar, w

Introduction to the Node. js lightweight Web framework Express4.x User Guide, node. jsexpress4.x Express is a lightweight Web framework that is simple and flexible It is also the most popular Nodejs-based Web framework. With this feature, we can quickly build a complete website (express) Express is now in version 4.x, which is updated quickly and is not compatible with earlier versions. As a result, many ex

Ubuntu 14.04/12.04 users install the lightweight music player Pragha Pragha is a practical, GTK + development, and has a simple interface for an open-source lightweight music player. The most popular audio format is supported. SQLite is used as its music database and dual-panel design. It allows users to search in the playback list by pressing Ctrl + F and has the function of an balancer, it is well integr

Python Development Lightweight Crawler (IMOOC summary 06--web parser)介绍网页解析器 将互联网的网页获取到本地以后，我们需要对它们进行解析才能够提取出我们需要的内容。 也就是说网页解析器是从网页中提取有价值数据的一种工具，对于搜索引擎来说它会提取出网页所有的url，用于后续的访问。 但是，对于我们定向爬虫来说，除了提取出待爬取的url之外，会提取出我们感兴趣的想要的有价值的数据。 也就是说，网页解析器会以下载好的HTML网页字符串作为输入，然后提取出有价值的数据和新的待爬取的url列表。Python有哪几种网页解析器呢？ 最直观的一种使用正则表达式，它会将整个网页当做一个字符串，然后使用模糊匹配方式来提取出有价值数据。 虽然直观，但是文档要是比较复杂的话，这种方式非常的麻烦。 我们可以使用python自带的html.parser来解析网页。 可以使用BeautifulSoup这个第三

Porteus Kiosk 4.1.0 Released, Porteus kiosk is a lightweight Linux operating system that is based on Gentoo Linux but is limited to allowing only one application to run as Firefox web browser. The browser is locked to prevent users from changing settings or downloading and installing other software. When the system starts, it automatically calls Firefox and opens the user-selected Start page (Basic tutorial qkxue.net). The browser does not save histor