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这篇文章主要讲解了“python的BeautifulSoup4库的用法介绍”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“python的BeautifulSoup4库的用法介绍”吧！
使用范例
常用的对象–Tag
常用的对象–NavigableString
常用的对象–BeautifulSoup
常用的对象–Comment
对文档树的遍历
tag中包含多个字符串的情况
.stripped_strings 去除空白内容
搜索文档树–find和find_all
select方法(各种查找)
获取内容
from bs4 import BeautifulSoup #创建 Beautiful Soup 对象 # 使用lxml来进行解析 soup = BeautifulSoup(html,"lxml") print(soup.prettify())
返回结果
就是 HTML 中的一个个标签
在上面范例的基础上添加
from bs4 import BeautifulSoup
html = """
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"""
#创建 Beautiful Soup 对象
# 使用lxml来进行解析
soup = BeautifulSoup(html,"lxml")
#print(soup.prettify())
#创建 Beautiful Soup 对象
soup = BeautifulSoup(html,'lxml')
print (soup.title)#None因为这里没有tiele标签所以返回none
print (soup.head)#None因为这里没有head标签所以返回none
print (soup.a)#返回 <a class="fill-dec" href="//my.csdn.net" target="_blank">编辑自我介绍，让更多人了解你<span class="write-icon"></span></a>
print (type(soup.p))#返回 <class 'bs4.element.Tag'>
print( soup.p)其中print( soup.p)
返回结果为
同样地，在上面地基础上添加
print (soup.name)# [document] #soup 对象本身比较特殊，它的 name 即为 [document]
返回
print (soup.head.name)#head #对于其他内部标签，输出的值为标签本身的名称
print (soup.p.attrs)##把p标签的所有属性打印出来,得到的类型是一个字典。
返回
print (soup.p['class'])#获取P标签下地class标签
soup.p['class'] = "newClass" print (soup.p) # 可以对这些属性和内容等等进行修改
返回
前面地基础上添加
print (soup.p.string) # The Dormouse's story print (type(soup.p.string)) # <class 'bs4.element.NavigableString'>thon
返回结果
beautiful soup对象表示文档的全部内容。大多数情况下，它可以被视为标记对象。它支持遍历文档树并搜索文档树中描述的大多数方法因为Beauty soup对象不是真正的HTML或XML标记，所以它没有名称和属性。但是，有时查看其内容很方便。Name属性，因此美丽的汤对象包含一个特殊属性。值为“[文档]”的名称
print(soup.name) #返回 '[document]'
用于解释注释部分的内容
markup = "<b><!--Hey, buddy. Want to buy a used parser?--></b>" soup = BeautifulSoup(markup) comment = soup.b.string type(comment) # <class 'bs4.element.Comment'>
在上面的基础上添加
head_tag = soup.div # 返回所有子节点的列表 print(head_tag.contents)
返回
同理
head_tag = soup.div # 返回所有子节点的迭代器 for child in head_tag.children: print(child)
返回
可用 .strings 来循环获取
for string in soup.strings: print(repr(string))
返回
for string in soup.stripped_strings: print(repr(string))
返回
找到所有
print(soup.find_all("a",id='link2'))find方法是找到第一个满足条件的标签后立即返回，返回一个元素。find_all方法是把所有满足条件的标签都选到，然后返回。
#通过标签名查找：
print(soup.select('a'))
#通过类名查找：
#通过类名，则应该在类的前面加一个'.'
print(soup.select('.sister'))
#通过id查找：
#通过id查找，应该在id的名字前面加一个＃号
print(soup.select("#link1"))查找a标签返回的结果
其他因为网页本身没有，返回的是一个空列表
组合查找
print(soup.select("p #link1"))#查找 p 标签中，id 等于 link1的内容子标签查找
print(soup.select("head > title"))通过属性查找
print(soup.select('a[href="http://example.com/elsie"]'))#属性与标签属同一节点，中间不能有空格先查看类型
print (type(soup.select('div')))
for title in soup.select('div'):
print (title.get_text())返回
print (soup.select('div')[20].get_text())#选取第20个div标签的内容返回
感谢各位的阅读，以上就是“python的BeautifulSoup4库的用法介绍”的内容了，经过本文的学习后，相信大家对python的BeautifulSoup4库的用法介绍这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是亿速云，小编将为大家推送更多相关知识点的文章，欢迎关注！
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