python xpath example

written in front of the words: the previous article we use requests to carry out some small reptile experiments, but want to more smoothly into the crawler learning, understand some of the methods of parsing Web pages is definitely necessary, so we will come together to learn the basic use of Lxml.etree moduleTips : Bloggers Use the system for WIN10, using a python version of 3.6.5First, Introduction to XPathTo understand

include statement fails, you need to install MSXML 4.0 SP1 SDK from://http://msdn.microsoft.com/downloads/sample.asp?url=/MSDN-FILES/027/001/766/msdncompositedoc.xml// You also need to add the include file and library search path// to Visual C++'s list of directories (Tools > Options... > Directories).using namespace MSXML2;inline void EVAL_HR( HRESULT _hr ) { if FAILED(_hr) throw(_hr); }#define TEMP_SIZE _MAX_PATH // size of short bufferstatic _TCHAR szTemp[TEMP_SIZE];

This article mainly describes the Python crawler XPath basic use of the details, and now share to everyone, but also to make a reference. Come and see it together. First, Introduction XPath is a language that looks for information in an XML document. XPath can be used to traverse elements and attributes in an XML docu

) scrapyPage(url)#爬取每页数据def scrapyPage(url): html = requests.get(url).text s = etree.HTML(html) trs = s.xpath(‘//*[@id="content"]/div/div[1]/div/table/tr‘) for tr in trs: href = tr.xpath(‘./td[2]/div/a/@href‘)[0] title = tr.xpath(‘./td[2]/div/a/text()‘)[0] score = tr.xpath(‘./td[2]/div/div/span[2]/text()‘)[0] number = tr.xpath(‘./td[2]/div/div/span[3]/text()‘)[0] img = tr.xpath(‘./td[1]/a/img/@src‘)[0] print href, title, score, number, img

This article mainly on the Selenium2 Web element positioning and XPath writing examples, please refer to the friends to discuss together. If there are deficiencies, please the great god, thank you!Through the Firefox browser plug-in Firebug + XPath checker, combined with three examples to illustrate the implementation of page element positioning and XPath path wr

Simple example of using XPath in dom4j, dom4jxpath instance As follows: Package com. wzh. test. xpath; import java. io. file; import org. dom4j. document; import org. dom4j. extends entexception; import org. dom4j. node; import org. dom4j. io. SAXReader; public class Demo4 {public static void main (String [] args) throws extends entexception {SAXReader reader = n

element is the same as its tag, this time cannot be positioned through the hierarchy, the index can be positioned as follows:driver.find_element_by_xpath("//select[@id=‘nr‘]/option[1]").click()driver.find_element_by_xpath("//select[@id=‘nr‘]/option[2]").click()driver.find_element_by_xpath("//select[@id=‘nr‘]/option[3]").click()The index here starts at 1, not the same as the Python index.6. XPath Logic oper

Introduction to XPath 1, parsing in XML and HTML using path expressions2, including standard function path (all libraries support the same XPath syntax)3,W3C Standard node:1 Body>First node:HTML>2 a> Head>AndBody>;a>AndDiv>;H1>AndH2>for the sibling node3 Div> H1>Isspan>Parent node, the samespan>IsH1>the child nodes4 H1>Becausespan>IsH1>The child node

language, and at least some basic concepts to know.HTML language is a Super text markup language, unlike the backend C,java,python, HTML is not a programming language, but a markup language, is a series of tags to describe the page. If there is no concept of the reader can simply interpret it as HTML language is through a sentence to tell the browser, first I want to put a piece of text here, and then in this one picture and so on, similar to drawing

This recommended combination is Xml.dom.minidom and XPath. Where Xml.dom.minidom is the standard library for Python, no installation is required. XPath is an open source project Py-dom-xpath by Google.Install Py-dom-xpath: Download the compressed package from https:

selection (when multiple nodes are matched but only one of them is desired) fromlxmlImportEtreetext=" "" "" "Select by order after matching nodes" "HTML=etree. HTML (text) result1= Html.xpath ('//li[1]/a/text ()')#Select the first of the Li nodes that match toPrint(RESULT1) result2= Html.xpath ('//li[last ()]/a/text ( )')#Select the last of the Li nodes that match toPrint(RESULT2) RESULT3= Html.xpath ('//li[position () )')#Select the position of all the Li nodes that match to be less than 3, a