xpath syntax in selenium

Second day, busy home some things, shun with people to crawl the watercress book top2501. Construct the URLs list urls=[' https://book.douban.com/top250?start={} '. Format (str (i) for I in range (0, 226, 25))]2. Module requests get webpage source code lxml Parse Web page XPath extract3. Extracting information4, can be encapsulated into a function here does not encapsulate the callPython code:#coding: Utf-8import sysreload (SYS) sys.setdefaultencoding

First, Htmlcleaner1. Create a Htmlcleaner objectHtmlcleaner Htmlcleaner = new Htmlcleaner ();2. Call the Clean methodTagnode Tagnode = Htmlcleaner.clean (HTML content or URL);3. Using XPathobject[] Aarr = Tagnode.evaluatexpath ("//div[@class = ' breadcrumb ']//a");Second, XPathExample: div, attribute class is all a label below breadcrumbdiv[@class = ' breadcrumb ']//aCommon Path Expressions: An expression Description NodeName Select all child nodes of thi

Selenium performing JQUERY/JS syntaxDriver.execute_script (JQUERY/JS)1. JQueryjquery only supports CSS syntax:jquery = ' $ (CSS). Val ("XXX"); ' # Navigate to elements based on CSS syntax, enter contentjquery = ' $ (CSS). Val ('); ' # emptyjquery = ' $ (CSS). Click (); # click2, JS1. Get document.getElementById ("id") by ID----------get a single2. Get document.getElementsbyname ("name") by Name[