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This article mainly introduces detailed information about the Python crawler package BeautifulSoup recursive crawling instance. For more information, see The Python crawler package BeautifulSoup recursive crawling instance. Summary: Crawlers primarily aim to crawl the desired content along the network. They are essentially a recursive process. They first need to obtain the content of the webpage, analyze the content of the page, find another URL, and then obtain the page content of the URL, and

:-Used when the client wants to determine and other available methods to retrieve or process a document on the WEB server.8)connect:-Used when the client wants to establish a transparent connection to a remote host, usually to facilitate ssl-encrypted com Munication (HTTPS) through an HTTP proxy.The GET Request MethodThe GET method is the simplest and the most frequently used request method. It is used to access the static resources, such as HTML documents and images. GET request can be used to

Machine learning and artificial Intelligence Learning Resource guidanceToplanguage (https://groups.google.com/group/pongba/)I often recommend some books in the toplanguage discussion group, and often ask the cows inside to gather some relevant information, artificial intelligence, machine learning, natural language processing, knowledge discovery (especially, data mining), information retrieval These are undoubtedly the most interesting branches of CS field (also closely related to each other),

For more information, please refer to: ISBN-wikipedia, here's a brief description of what the ISBN code is: ISBN (International Standard book NUMBER,ISBN; intended pronunciation is-ben), is the code of international Books or independent publications (in addition to periodical publications). Publishers can clearly identify all non-periodical books through the ISBN. One ISBN only one or a corresponding publication corresponds to it. The new version will

the number of characters in each row in the file again and save it in the ed of the memory RDD. Then read the number of each character in mapped, add it to 2, and calculate the read + add time consumption. Only map, no reduce. Test 10 Gb Wiki The read performance of RDD is tested. Root @ master:/opt/spark #./run spark. Examples. hdfstest master @ master: 5050 HDFS: // master: 9000:/user/lijiexu/Wikipedia/TXT/enwiki-20110405.txt

For example, the x-axis unit measure length changes to the original 1/2,y axis unit measure length to the original 1/3, that is, with the matrix By multiplying it into a Cartesian coordinate system I. That is, the transformation is applied to the coordinate system by multiplying it with the transformation matrix. ”1.1 A bunch of basic conceptsAccording to Wikipedia, in the Matrix, t

nodes contain all the instances belonging to the sub-nodes, but this does not have this requirement, and more specifically domain-specific KBS. global KBS: domain-specific KB: dblp, Google Scholar, dblife, echonestglobal kb in specific fields: freebase, Google's knowledge graph, Yago, dbpedia, and the collection of Wikipedia infoboxes. although global KB is important, domain-specific KB is also important in some specific fields. Ontology-like KBS vs.

In fact, Ghost's browser function is based on the Trident engine. In addition to the basic browsing function (SEE), ghost allows users to freely filter a large amount of visualization information. Pivot allows you to visualize links to websites in favorites (display webpages). You can select the desired conditions on the fil

content in multiple places, so that the content is closer to the user and the chances are higher. -- Using Google's bigtable, a distributed data storage and databaseShards: different users specify different shards,Use bigtable to back up images to different data centers,CodeCheck who is the most recent Here is the detailed architecture description of YouTube. 4. Summary of plentyoffish Architecture I think this is the most amazing thing. A person who spends 2 hours a day can maintain a d

can well process large and active datasets. (Editor's note: Facebook uses Cassandra for email search .) More You have more options as needed. See this list in Wikipedia. Cache data Because data needs to be frequently used, it is more reasonable to store the data in the memory than to be queried in the database each time. This greatly improves the running speed of Web applications. 3. memcached Memcached is a simple but powerful solution for cac

[News] Wikipedia founder Jimbo Wales has set up a profitable company Wikipedia, which will start a brand new search engine that relies on the power of everyone, not simply machine-supported like Google. For more information, see the Times report and Mashable report. There is an unknown translation on csdn, with hundreds of errors. I hope to correct it as soon as possible. Please note that Wales has stated t

-CN '* @ see ================================ ========================================================== ========================================================== = * @ see method for parsing the JSON string returned by Google * @ see in the JSON string returned by Google, the URL of the image is directly added to JSON with the 'url' parameter and returned to us * @ see. Therefore, we can directly parse the 'url' parameter value in the returned JSON string. The following is an example of the fo

present, the work of the secondary plane is mainly concentrated in the unified ideographic texts of China, Japan and Korea on the second and third planes, therefore, the coordination of various encodings and Unicode including GBK, gb18030, and big5 in simplified Chinese, traditional Chinese, Japanese, Korean, and Vietnamese characters has been highlighted. Considering that Unicode will eventually cover all characters. In a sense, these encoding methods can also be viewed as Unicode appearing be

This is actually a pseudo-problem, because most software practitioners believe No silver bulletBut this concept often needs to be strengthened. As Ivar said, the software industry is a fashion industry. People Constantly package and combine old concepts to create new concepts. In the past decade Object-oriented /UMLThen CMM (I)It is sold as a silver bullet. According to my personal observation, agility has been turned into a silver bullet. So what is agile? Although the concept of agility has be

, refer to the parser entries in wikipedia. 2. Syntax-Directed Translation, SDT)Syntax-guided translation refers to a conversion process in which the input string is translated into a series of semantic actions, which are achieved by appending rules or program fragments to the syntax-generated form. SDT provides a simple method for appending a semantic action (semantic actions) to a syntax.SDT has two important concepts:Syntax-Directed Definition (SD

Professional-amateur Joint Sports were born in the popularization of production tools: the garage band provided by Apple's Mac computer can "record your next hot song ", digital cameras and desktop editing software generate a family of movie producers, making online publishing easy. We are switching from passive consumers to active producers. Amateur blogs are competing for attention with the main streaming media, while obscure bands are releasing unlabeled music online, children can use video g

I am worried about authority. I once said in the article "strongopinions, weakly held" (with clear points of view, but not stubborn: When I understand that others regard me as an expert or authority, rather than a similar spof like a partner, I feel very troubled. If I have learned something in my career so far, it must be: When you face software development with an expert or self-thinking insight, you will face failure. If there are so-called experts, they must be more untrusted than ordinary p

platform GCC can be compiled, and then get the B platform with a similar version of the GCC compiled, generally not too much problem. So GCC is sure to consider the support.Second, consider whether to support the local compiler. The so-called local compiler is the operating system manufacturer's own compiler. For example, the local compiler relative to Windows is Visual C + +. The local compiler relative to Solaris is Sun's CC. If you are sensitive to performance or want to use some of the adva

Rasmus Lerdorf as early as 2003 admitted that he did not know how to write programming language, just take a step to see a step, think of what Add. For example, the PHP function "mysql_escape_string", which prevents malicious data attacks, was found to be flawed, instead of patching the function, it re-developed a function called "mysql_real_escape_string". This is like installing two similar buttons in the cockpit, pressing one to put down the landing gear, while pressing the other will cause

today's web networks are based on PHP design, with 39% of Web sites using PHP. Facebook, Wikipedia, and WordPress are all PHP projects. This is because PHP has a lot of flaws, but it's quick to get started. The name PHP comes from the original "home page", which makes it easy for users to add dynamic content such as dates and usernames to static HTML pages. PHP implements a fly-through from designing a Web site to writing a Web application, but with