BeautifulSoup库
一、安装BeautifulSoup库
可以现在目前python安装了哪些包
安装beautifulsoup
二、beautifulsoup官网
https://www.crummy.com/software/BeautifulSoup/bs4/doc/
三、beautifulsoup的主要解析器
四、beautifulsoup的find函数
查找html的title
from bs4 import BeautifulSoup
html="""
<html lang="en">
<head>
<meta charset="UTF-8">
<title>bobby基本信息</title>
<script src="jquery-3.5.1.min.js"></script>
</head>
<body>
<div id="info">
<p style="color: blue">讲师信息</p>
<div class="teacher_info">
Python全栈工程师
<p class="age">年龄：29</p>
<p class="name">姓名：bobby</p>
<p class="work_years">工作年限：7年</p>
<p class="position">职位：python开发工程师</p>
</div>
<p style="color:aquamarine">课程信息</p>
<table class="courses">
<tbody><tr><th>课程名称</th>
<th>讲师</th>
<th>地址</th>
</tr><tr>
<td>django打造在线教育</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/78.html">访问</a></td>
</tr><tr>
<td>python高级编程</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/200.html">访问</a></td>
</tr><tr>
<td>scrapy分布式爬虫</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/92.html">访问</a></td>
</tr><tr>
<td>diango rest framework打造生鲜电商</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/131.html">访问</a></td>
</tr><tr>
<td>tornado从入门到精通</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/290.html">访问</a></td>
</tr></tbody></table>
</div>
</body>
</html>
"""
bs=BeautifulSoup(html,"html.parser")
title_tag=bs.title.string
print(title_tag)
#点取元素的时候，只取第一个匹配的元素
div_tag1=bs.title
print("div_tag1:"+str(div_tag1))
输出结果：
查找html中的div元素
from bs4 import BeautifulSoup
html="""
<html lang="en">
<head>
<meta charset="UTF-8">
<title>bobby基本信息</title>
<script src="jquery-3.5.1.min.js"></script>
</head>
<body>
<div id="info">
<p style="color: blue">讲师信息</p>
<div class="teacher_info">
Python全栈工程师
<p class="age">年龄：29</p>
<p class="name">姓名：bobby</p>
<p class="work_years">工作年限：7年</p>
<p class="position">职位：python开发工程师</p>
</div>
<p style="color:aquamarine">课程信息</p>
<table class="courses">
<tbody><tr><th>课程名称</th>
<th>讲师</th>
<th>地址</th>
</tr><tr>
<td>django打造在线教育</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/78.html">访问</a></td>
</tr><tr>
<td>python高级编程</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/200.html">访问</a></td>
</tr><tr>
<td>scrapy分布式爬虫</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/92.html">访问</a></td>
</tr><tr>
<td>diango rest framework打造生鲜电商</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/131.html">访问</a></td>
</tr><tr>
<td>tornado从入门到精通</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/290.html">访问</a></td>
</tr></tbody></table>
</div>
</body>
</html>
"""
bs=BeautifulSoup(html,"html.parser")
div_tag2=bs.find("div")
print("div_tag2:"+str(div_tag2))
输出结果：
查找html中的所有P元素
from bs4 import BeautifulSoup
html="""
<html lang="en">
<head>
<meta charset="UTF-8">
<title>bobby基本信息</title>
<script src="jquery-3.5.1.min.js"></script>
</head>
<body>
<div id="info">
<p style="color: blue">讲师信息</p>
<div class="teacher_info">
Python全栈工程师
<p class="age">年龄：29</p>
<p class="name">姓名：bobby</p>
<p class="work_years">工作年限：7年</p>
<p class="position">职位：python开发工程师</p>
</div>
<p style="color:aquamarine">课程信息</p>
<table class="courses">
<tbody><tr><th>课程名称</th>
<th>讲师</th>
<th>地址</th>
</tr><tr>
<td>django打造在线教育</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/78.html">访问</a></td>
</tr><tr>
<td>python高级编程</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/200.html">访问</a></td>
</tr><tr>
<td>scrapy分布式爬虫</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/92.html">访问</a></td>
</tr><tr>
<td>diango rest framework打造生鲜电商</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/131.html">访问</a></td>
</tr><tr>
<td>tornado从入门到精通</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/290.html">访问</a></td>
</tr></tbody></table>
</div>
</body>
</html>
"""
bs=BeautifulSoup(html,"html.parser")
#找回所有的元素
div_tag3=bs.find_all("p")
print("p:"+str(div_tag3))
for p in div_tag3:
print(p.string)
输出结果：
指定id进行html查找
from bs4 import BeautifulSoup
html="""
<html lang="en">
<head>
<meta charset="UTF-8">
<title>bobby基本信息</title>
<script src="jquery-3.5.1.min.js"></script>
</head>
<body>
<div id="info">
<p style="color: blue">讲师信息</p>
<div class="teacher_info">
Python全栈工程师
<p class="age">年龄：29</p>
<p class="name">姓名：bobby</p>
<p class="work_years">工作年限：7年</p>
<p class="position">职位：python开发工程师</p>
</div>
<p style="color:aquamarine">课程信息</p>
<table class="courses">
<tbody><tr><th>课程名称</th>
<th>讲师</th>
<th>地址</th>
</tr><tr>
<td>django打造在线教育</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/78.html">访问</a></td>
</tr><tr>
<td>python高级编程</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/200.html">访问</a></td>
</tr><tr>
<td>scrapy分布式爬虫</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/92.html">访问</a></td>
</tr><tr>
<td>diango rest framework打造生鲜电商</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/131.html">访问</a></td>
</tr><tr>
<td>tornado从入门到精通</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/290.html">访问</a></td>
</tr></tbody></table>
</div>
</body>
</html>
"""
bs=BeautifulSoup(html,"html.parser")
div_tag4=bs.find(id="info")
print("div_tag4:"+str(div_tag4))
div_tag5=bs.find_all("div",id="info")
print("div_tag5:"+str(div_tag5))
输出结果：
正则表达式匹配元素
import re
from bs4 import BeautifulSoup
html="""
<html lang="en">
<head>
<meta charset="UTF-8">
<title>bobby基本信息</title>
<script src="jquery-3.5.1.min.js"></script>
</head>
<body>
<div id="info-955">
<p style="color: blue">讲师信息</p>
<div class="teacher_info">
Python全栈工程师
<p class="age">年龄：29</p>
<p class="name">姓名：bobby</p>
<p class="work_years">工作年限：7年</p>
<p class="position">职位：python开发工程师</p>
</div>
<p style="color:aquamarine">课程信息</p>
<table class="courses">
<tbody><tr><th>课程名称</th>
<th>讲师</th>
<th>地址</th>
</tr><tr>
<td>django打造在线教育</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/78.html">访问</a></td>
</tr><tr>
<td>python高级编程</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/200.html">访问</a></td>
</tr><tr>
<td>scrapy分布式爬虫</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/92.html">访问</a></td>
</tr><tr>
<td>diango rest framework打造生鲜电商</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/131.html">访问</a></td>
</tr><tr>
<td>tornado从入门到精通</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/290.html">访问</a></td>
</tr></tbody></table>
</div>
</body>
</html>
"""
bs=BeautifulSoup(html,"html.parser")
div_tag=bs.find("div",id=re.compile("info-\d+"))
print(div_tag)
输出结果：
根据网页字符串定位元素
import re
from bs4 import BeautifulSoup
html="""
<html lang="en">
<head>
<meta charset="UTF-8">
<title>bobby基本信息</title>
<script src="jquery-3.5.1.min.js"></script>
</head>
<body>
<div id="info-955">
<p style="color: blue">讲师信息</p>
<div class="teacher_info">
Python全栈工程师
<p class="age">年龄：29</p>
<p class="name">姓名：bobby</p>
<p class="work_years">工作年限：7年</p>
<p class="position">职位：python开发工程师</p>
</div>
<p style="color:aquamarine">课程信息</p>
<table class="courses">
<tbody><tr><th>课程名称</th>
<th>讲师</th>
<th>地址</th>
</tr><tr>
<td>django打造在线教育</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/78.html">访问</a></td>
</tr><tr>
<td>python高级编程</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/200.html">访问</a></td>
</tr><tr>
<td>scrapy分布式爬虫</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/92.html">访问</a></td>
</tr><tr>
<td>diango rest framework打造生鲜电商</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/131.html">访问</a></td>
</tr><tr>
<td>tornado从入门到精通</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/290.html">访问</a></td>
</tr></tbody></table>
</div>
</body>
</html>
"""
bs=BeautifulSoup(html,"html.parser")
div_tag=bs.find(string="django打造在线教育")
print(div_tag)
输出结果：
输出dom树子标签的标签名
import re
from bs4 import BeautifulSoup
html="""
<html lang="en">
<head>
<meta charset="UTF-8">
<title>bobby基本信息</title>
<script src="jquery-3.5.1.min.js"></script>
</head>
<body>
<div id="info-955">
<p style="color: blue">讲师信息</p>
<div class="teacher_info">
Python全栈工程师
<p class="age">年龄：29</p>
<p class="name">姓名：bobby</p>
<p class="work_years">工作年限：7年</p>
<p class="position">职位：python开发工程师</p>
</div>
<p style="color:aquamarine">课程信息</p>
<table class="courses">
<tbody><tr><th>课程名称</th>
<th>讲师</th>
<th>地址</th>
</tr><tr>
<td>django打造在线教育</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/78.html">访问</a></td>
</tr><tr>
<td>python高级编程</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/200.html">访问</a></td>
</tr><tr>
<td>scrapy分布式爬虫</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/92.html">访问</a></td>
</tr><tr>
<td>diango rest framework打造生鲜电商</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/131.html">访问</a></td>
</tr><tr>
<td>tornado从入门到精通</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/290.html">访问</a></td>
</tr></tbody></table>
</div>
</body>
</html>
"""
bs=BeautifulSoup(html,"html.parser")
div_tag=bs.find("div",id=re.compile("info-\d+"))
childrens=div_tag.contents
for child in childrens:
if child.name:
print(child.name)
childrens_childrens = div_tag.descendants
for child_child in childrens_childrens:
if child_child.name:
print(child_child.name)
输出如下：输出子标签的标签名，遍历子元素
输出dom树的父标签的标签名
import re
from bs4 import BeautifulSoup
html="""
<html lang="en">
<head>
<meta charset="UTF-8">
<title>bobby基本信息</title>
<script src="jquery-3.5.1.min.js"></script>
</head>
<body>
<div id="info-955">
<p style="color: blue">讲师信息</p>
<div class="teacher_info">
Python全栈工程师
<p class="age">年龄：29</p>
<p class="name">姓名：bobby</p>
<p class="work_years">工作年限：7年</p>
<p class="position">职位：python开发工程师</p>
</div>
<p style="color:aquamarine">课程信息</p>
<table class="courses">
<tbody><tr><th>课程名称</th>
<th>讲师</th>
<th>地址</th>
</tr><tr>
<td>django打造在线教育</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/78.html">访问</a></td>
</tr><tr>
<td>python高级编程</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/200.html">访问</a></td>
</tr><tr>
<td>scrapy分布式爬虫</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/92.html">访问</a></td>
</tr><tr>
<td>diango rest framework打造生鲜电商</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/131.html">访问</a></td>
</tr><tr>
<td>tornado从入门到精通</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/290.html">访问</a></td>
</tr></tbody></table>
</div>
</body>
</html>
"""
bs=BeautifulSoup(html,"html.parser")
parents=bs.find("p",{"class":"name"}).parents
for parent in parents:
print(parent.name)
输出结果：
输出dom树的兄弟标签的标签名
输出下一个兄弟标签的标签名
import re
from bs4 import BeautifulSoup
html="""
<html lang="en">
<head>
<meta charset="UTF-8">
<title>bobby基本信息</title>
<script src="jquery-3.5.1.min.js"></script>
</head>
<body>
<div id="info-955">
<p style="color: blue">讲师信息</p>
<div class="teacher_info">
Python全栈工程师
<p class="age">年龄：29</p>
<p class="name">姓名：bobby</p>
<p class="work_years">工作年限：7年</p>
<p class="position">职位：python开发工程师</p>
</div>
<p style="color:aquamarine">课程信息</p>
<table class="courses">
<tbody><tr><th>课程名称</th>
<th>讲师</th>
<th>地址</th>
</tr><tr>
<td>django打造在线教育</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/78.html">访问</a></td>
</tr><tr>
<td>python高级编程</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/200.html">访问</a></td>
</tr><tr>
<td>scrapy分布式爬虫</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/92.html">访问</a></td>
</tr><tr>
<td>diango rest framework打造生鲜电商</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/131.html">访问</a></td>
</tr><tr>
<td>tornado从入门到精通</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/290.html">访问</a></td>
</tr></tbody></table>
</div>
</body>
</html>
"""
bs=BeautifulSoup(html,"html.parser")
next_siblings=bs.find("p",{"class":"age"}).next_siblings
for sibling in next_siblings:
print(sibling.string)
输出结果：
输出上一个兄弟标签的标签名
import re
from bs4 import BeautifulSoup
html="""
<html lang="en">
<head>
<meta charset="UTF-8">
<title>bobby基本信息</title>
<script src="jquery-3.5.1.min.js"></script>
</head>
<body>
<div id="info-955">
<p style="color: blue">讲师信息</p>
<div class="teacher_info">
Python全栈工程师
<p class="age">年龄：29</p>
<p class="name">姓名：bobby</p>
<p class="work_years">工作年限：7年</p>
<p class="position">职位：python开发工程师</p>
</div>
<p style="color:aquamarine">课程信息</p>
<table class="courses">
<tbody><tr><th>课程名称</th>
<th>讲师</th>
<th>地址</th>
</tr><tr>
<td>django打造在线教育</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/78.html">访问</a></td>
</tr><tr>
<td>python高级编程</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/200.html">访问</a></td>
</tr><tr>
<td>scrapy分布式爬虫</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/92.html">访问</a></td>
</tr><tr>
<td>diango rest framework打造生鲜电商</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/131.html">访问</a></td>
</tr><tr>
<td>tornado从入门到精通</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/290.html">访问</a></td>
</tr></tbody></table>
</div>
</body>
</html>
"""
bs=BeautifulSoup(html,"html.parser")
previous_siblings=bs.find("p",{"class":"name"}).previous_siblings
for sibling in previous_siblings:
print(sibling.string)
输出结果：
如果要输出前一个兄弟标签的标签名，需要去掉回车换行符
import re
from bs4 import BeautifulSoup
html="""
<html lang="en">
<head>
<meta charset="UTF-8">
<title>bobby基本信息</title>
<script src="jquery-3.5.1.min.js"></script>
</head>
<body>
<div id="info-955">
<p style="color: blue">讲师信息</p>
<div class="teacher_info">
Python全栈工程师
<p class="age">年龄：29</p><p class="name">姓名：bobby</p>
<p class="work_years">工作年限：7年</p>
<p class="position">职位：python开发工程师</p>
</div>
<p style="color:aquamarine">课程信息</p>
<table class="courses">
<tbody><tr><th>课程名称</th>
<th>讲师</th>
<th>地址</th>
</tr><tr>
<td>django打造在线教育</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/78.html">访问</a></td>
</tr><tr>
<td>python高级编程</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/200.html">访问</a></td>
</tr><tr>
<td>scrapy分布式爬虫</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/92.html">访问</a></td>
</tr><tr>
<td>diango rest framework打造生鲜电商</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/131.html">访问</a></td>
</tr><tr>
<td>tornado从入门到精通</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/290.html">访问</a></td>
</tr></tbody></table>
</div>
</body>
</html>
"""
bs=BeautifulSoup(html,"html.parser")
previous_sibling=bs.find("p",{"class":"name"}).previous_sibling
print(previous_sibling.string)
注意：此处html去掉回车换行符，否则无输出
输出结果：
获取html的某些标签元素的属性值
import re
from bs4 import BeautifulSoup
html="""
<html lang="en">
<head>
<meta charset="UTF-8">
<title>bobby基本信息</title>
<script src="jquery-3.5.1.min.js"></script>
</head>
<body>
<div id="info-955">
<p style="color: blue">讲师信息</p>
<div class="teacher_info">
Python全栈工程师
<p class="age">年龄：29</p>
<p class="name">姓名：bobby</p>
<p class="work_years">工作年限：7年</p>
<p class="position">职位：python开发工程师</p>
</div>
<p style="color:aquamarine">课程信息</p>
<table class="courses">
<tbody><tr><th>课程名称</th>
<th>讲师</th>
<th>地址</th>
</tr><tr>
<td>django打造在线教育</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/78.html">访问</a></td>
</tr><tr>
<td>python高级编程</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/200.html">访问</a></td>
</tr><tr>
<td>scrapy分布式爬虫</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/92.html">访问</a></td>
</tr><tr>
<td>diango rest framework打造生鲜电商</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/131.html">访问</a></td>
</tr><tr>
<td>tornado从入门到精通</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/290.html">访问</a></td>
</tr></tbody></table>
</div>
</body>
</html>
"""
bs=BeautifulSoup(html,"html.parser")
name_tag=bs.find("p",{"class":"name"})
print(name_tag["class"])
print(name_tag.get("class"))
输出结果：
元素多值属性问题
import re
from bs4 import BeautifulSoup
html="""
<html lang="en">
<head>
<meta charset="UTF-8">
<title>bobby基本信息</title>
<script src="jquery-3.5.1.min.js"></script>
</head>
<body>
<div id="info-955">
<p style="color: blue">讲师信息</p>
<div class="teacher_info">
Python全栈工程师
<p class="age">年龄：29</p>
<p class="name bobbyname" data-bind="bobby">姓名：bobby</p>
<p class="work_years">工作年限：7年</p>
<p class="position">职位：python开发工程师</p>
</div>
<p style="color:aquamarine">课程信息</p>
<table class="courses">
<tbody><tr><th>课程名称</th>
<th>讲师</th>
<th>地址</th>
</tr><tr>
<td>django打造在线教育</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/78.html">访问</a></td>
</tr><tr>
<td>python高级编程</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/200.html">访问</a></td>
</tr><tr>
<td>scrapy分布式爬虫</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/92.html">访问</a></td>
</tr><tr>
<td>diango rest framework打造生鲜电商</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/131.html">访问</a></td>
</tr><tr>
<td>tornado从入门到精通</td>
<td>bobby</td>
<td><a href="https://coding.imooc.com/class/290.html">访问</a></td>
</tr></tbody></table>
</div>
</body>
</html>
"""
bs=BeautifulSoup(html,"html.parser")
name_tag=bs.find("p",{"class":"name"})
print(name_tag["class"])
print(name_tag.get("class"))
print(name_tag["data-bind"])
print(name_tag.get("data-bind"))
输出结果：
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