BeautifulSoup420文档.docx

Beautiful Soup 4.2.0 文档/software/BeautifulSoup/bs4/doc/index.zh.html?/software/BeautifulSoup/Beautiful Soup 是一个可以从HTML或XML文件中提取数据的Python库.它能够通过你喜欢的转换器实现惯用的文档导航,查找,修改文档的方式.Beautiful Soup会帮你节省数小时甚至数天的工作时间.这篇文档介绍了BeautifulSoup4中所有主要特性,并切有小例子.让我来向你展示它适合做什么,如何工作,怎样使用,如何达到你想要的效果,和处理异常情况.文档中出现的例子在Python2.7和Python3.2中的执行结果相同你可能在寻找 /software/BeautifulSoup/bs3/documentation.htmlBeautiful Soup3 的文档,Beautiful Soup 3 目前已经停止开发,我们推荐在现在的项目中使用Beautiful Soup 4, 移植到BS4寻求帮助/software/BeautifulSoup/bs4/doc/index.zh.html?如果你有关于BeautifulSoup的问题,可以发送邮件到 /forum/?fromgroups讨论组 .如果你的问题包含了一段需要转换的HTML代码,那么确保你提的问题描述中附带这段HTML文档的 /software/BeautifulSoup/bs4/doc/index.zh.html代码诊断 /software/BeautifulSoup/bs4/doc/index.zh.html[1]快速开始/software/BeautifulSoup/bs4/doc/index.zh.html?下面的一段HTML代码将作为例子被多次用到.这是 爱丽丝梦游仙境的 的一段内容(以后内容中简称为 爱丽丝 的文档):html_doc = htmlheadtitleThe Dormouses story/title/headbodyp class=titlebThe Dormouses story/b/pp class=storyOnce upon a time there were three little sisters; and their names werea href=/elsie class=sister id=link1Elsie/a,a href=/lacie class=sister id=link2Lacie/a anda href=/tillie class=sister id=link3Tillie/a;and they lived at the bottom of a well./pp class=story.../p使用BeautifulSoup解析这段代码,能够得到一个 BeautifulSoup 的对象,并能按照标准的缩进格式的结构输出:from bs4 import BeautifulSoupsoup = BeautifulSoup(html_doc)print(soup.prettify())# html# head#title# The Dormouses story#/title# /head# body#p class=title#b# The Dormouses story#/b#/p#p class=story# Once upon a time there were three little sisters; and their names were#a class=sister href=/elsie id=link1# Elsie#/a# ,#a class=sister href=/lacie id=link2# Lacie#/a# and#a class=sister href=/tillie id=link2# Tillie#/a# ; and they lived at the bottom of a well.#/p#p class=story# ...#/p# /body# /html几个简单的浏览结构化数据的方法:soup.title# titleThe Dormouses story/title# utitlesoup.title.string# uThe Dormouses story# uheadsoup.p# p class=titlebThe Dormouses story/b/psoup.p[class]# utitlesoup.a# a class=sister href=/elsie id=l