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BeautifulSoup is a third-party library of Python that can be used to help parse content such as html/xml to crawl specific page information. The latest is the V4 version, here is the main summary of the V3 version I used to parse HTML some common methods.
Get ready
1.Beautiful Soup Installation
In order to be able to parse the content in the page, this article uses beautiful Soup. Of course, the sample req
2013-07-30 22:54 by Lake, 2359 Read, 0 reviews, Favorites, compilation Beautiful Soup is a html/xml parser written in Python that can handle nonstandard tags and generate parse trees very well. Typically used to analyze Web documents crawled by crawlers. For irregular HTML documents, there are many complementary functions, saving developers time and effort.Beautiful Soup's official documentation is complete
This article mainly describes the usage of the Python crawler BeautifulSoup by using video crawling instances. BeautifulSoup is a package designed for Python to obtain data, which is concise and powerful. For more information, see
1. Install BeautifulSoup4Easy_install
easy_install beautifulsoup4
Pip installation met
PrefaceBefore using Python to crawl the Web page, always use the regex or the Sgmlparser in the library sgmllib. But when faced with a complicated situation, sgmlparser often does not give the force! (Ha, say I too native? After all, BeautifulSoup is inherited Sgmlparser ~) So, I look for search and find, found beautifulsoup
Excerpted from http://www.cnblogs.com/twinsclover/archive/2012/04/26/2471704.htmlPrefaceBefore using Python to crawl the Web page, always use the regex or the Sgmlparser in the library sgmllib. But when faced with a complicated situation, sgmlparser often does not give the force! (Ha, say I too native? After all, BeautifulSoup is inherited Sgmlparser ~) So, I loo
Before a formal crawl, do a test to see how the type of data object crawled is converted to a list:Write an HTML document: x.htmlHTML>Head>title>This is a Python demo pagetitle>Head>Body> Pclass= "title"> a>The demo Python introduces several Python courses.a> ahref= "http://www.icourse163.org/course/BIT-133"class= "Py1"ID= "Link1">Basic Pythona> P> P
Transferred from: http://www.cnblogs.com/rzhang/archive/2011/12/29/python-html-parsing.html Python commonly used in the page parsing library has BeautifulSoup and lxml.html, the former may be more well-known, the panda began to use the BeautifulSoup, but found that it really has a few problems around the past, so the f
Python crawler tool: BeautifulSoup library,
Beautiful Soup parses anything you give it, and does the tree traversal stuff for you.
BeautifulSoup is a functional library for parsing, traversing, and maintaining the "Tag Tree ".(Traversal means that each node in the tree is accessed once and only once along a search route ). Https://www.crummy.com/software/
Comparisonh3>Then we'll analyze the URL of the webpage:If the URL of the page we want to crawl is:http://www.covers.com/pageLoader/pageLoader.aspx?page=/data/nba/matchups/g5_preview_12.htmlBecause there is experience on site, so can be hereWww.covers.com is the domain name;/pageloader/pageloader.aspxpage=/data/nba/matchups/g5_preview_12.html, possibly/pageloader/for the root of the Web page that is placed on the server pageloader.aspx?page=/data/nba/
First glimpse of the web crawlerare used by Python3.A simple example: from Import = Urlopen ("http://pythonscraping.com/pages/page1.html") Print(Html.read ())In Python 2.x, the Urllib2 library, in Python 3.x, Urllib2 renamed Urllib, divided into sub-modules: Urllib.request, Urllib.parse, and Urllib.error.Two BeautifulSoup
Workaround One:
Use Python beautifulsoup to crawl the page and then output the page title, but the output is always garbled, find a long time to find a solution, the following share to everyoneThe first is the codeCopy the Code code as follows:
From BS4 import BeautifulSoup
Import Urllib2
url = ' http://www.jb51.net/'
page = Urllib2.urlopen (URL)
Soup =
Original address: http://www.cnblogs.com/twinsclover/archive/2012/04/26/2471704.htmlPrefaceBefore using Python to crawl the Web page, always use the regex or the Sgmlparser in the library sgmllib. But when faced with a complicated situation, sgmlparser often does not give the force! (Ha, say I too native? After all, BeautifulSoup is inherited Sgmlparser ~) So, I
': ', ' class ': [' No-login ']} [' No-login ']LoginHere's the note.HTML content traversal of the BS4 libraryThe basic structure of HTMLDownlink traversal of the tag treeWhere the BeautifulSoup type is the root node of the tag tree.1 # Traverse son node 2 for inch Soup.body.children: 3 Print (Child.name) 4 5 # Traverse descendant Nodes 6 for inch soup.body.descendants: 7 Print (Child.name)Upstream traversal of the tag tree1 # Traverse all a
Web Crawler: crawls book information from allitebooks.com and captures the price from amazon.com (1): Basic knowledge Beautiful Soup, beautifulsoupFirst, start with Beautiful Soup (Beautiful Soup is a Python library that parses data from HTML and XML ), I plan to learn the Beautiful Soup process with three blog posts. The first is the basic knowledge of beauul ul Soup, and the second is a simple crawler usi
Previously we were using Python's own parser, Html.parser. Official web side There are some other parsers, we learn from each other.
Parser
How to use
Advantages
Disadvantages
Htm.parser
BeautifulSoup (markup, ' Html.parser ')
1. Python comes with2, the resolution speed is passable3, fault-tolerant strong
forLinkinchSs.find_all ("a"): + Print(Link.get ("Link"))#get links to all - the Print(Ss.get_text ())#get all the text from the document1 ImportRequests2 fromBs4ImportBeautifulSoup3 4Html_doc ="""5 6 7 8 three Little Sisters; and their names were9 " id= "Link1" >ELSIETen and One " id= "Link3" >Tillie A and they lived at the bottom of a well. - - the """ -Soup = BeautifulSoup (Html_doc,'Html.parser')#declaring
I've talked about using PHANTOMJS as a crawler to catch Web pages www.jb51.net/article/55789.htm is a match selector.
With BeautifulSoup (document: www.crummy.com/software/BeautifulSoup/bs4/doc/), this Python module makes it easy to crawl web content
# coding=utf-8import u
Workaround One:
Use Python beautifulsoup to crawl the page and then output the page title, but the output is always garbled, find a long time to find solutions, the following share to everyoneFirst, the code.
Copy Code code as follows:
From BS4 import BeautifulSoup
Import Urllib2
url = ' http://www.jb51.net/'
page = Urllib2.urlopen (URL)
This article mainly introduces python using beautifulSoup to implement crawler, need friends can refer to the previous said using phantomjs crawling web http://www.jb51.net/article/55789.htm is with selector to do
Using the beautifulSoup (document: http://www.crummy.com/software/B
I used to talk about using PHANTOMJS as a crawler to catch a Web page http://www.jb51.net/article/55789.htm is made with a selector.
Using the Python module BeautifulSoup (document: http://www.crummy.com/software/BeautifulSoup/bs4/doc/), it's easy to crawl Web content
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