#！Usr/bin/env python # -*- coding:utf-8 -*- # Author:Alex Li html = """ <html><head><title>The Dormouse's story</title></head> <body> <p class="title" name="dromouse"><b>The Dormouse's story</b></p> <p class="story">Once upon a time there were three little sisters; and their names were <a href="http://example.com/elsie" class="sister" id="link1"><!-- Elsie --></a>, <a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and <a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>; and they lived at the bottom of a well.</p> <p class="story">...</p> """ from bs4 import BeautifulSoup import re import urllib.request import requests soup = BeautifulSoup(html) print(soup.prettify()) #以网页格式输出 print(soup.title.string) #获得title标签内的内容 print(soup.a.string) print(type(soup.title)) #返回<class 'bs4.element.Tag'> 这种格式可以进行嵌套 print(soup.title) #输出title标签带内容<title>The Dormouse's story</title> print(soup.head) print(soup.li) #没有返回None html = """ <html><head><title>The Dormouse's story</title></head> <body> <p class="title" name="dromouse"><b>The Dormouse's story</b></p> <p class="story">Once upon a time there were three little sisters; and their names were <a href="http://example.com/elsie" class="sister" id="link1"><!-- Elsie --></a>, <a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and <a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>; and they lived at the bottom of a well.</p> <p class="story">...</p> """ from bs4 import BeautifulSoup soup = BeautifulSoup(html) print(soup.title.name) #返回title标签的名称 title html = """ <html><head><title>The Dormouse's story</title></head> <body> <p class="title" name="dromouse"><b>The Dormouse's story</b></p> <p class="story">Once upon a time there were three little sisters; and their names were <a href="http://example.com/elsie" class="sister" id="link1"><!-- Elsie --></a>, <a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and <a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>; and they lived at the bottom of a well.</p> <p class="story">...</p> """ from bs4 import BeautifulSoup soup = BeautifulSoup(html) print(soup.p.attrs['name']) #两种格式输出P标签name='dromouse' print(soup.p['name']) print(soup.a['href']) #返回http://example.com/elsie html = """ <html><head><title>The Dormouse's story</title></head> <body> <p clss="title" name="dromouse"><b>The Dormouse's story</b></p> <p class="story">Once upon a time there were three little sisters; and their names were <a href="http://example.com/elsie" class="sister" id="link1"><!-- Elsie --></a>, <a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and <a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>; and they lived at the bottom of a well.</p> <p class="story">...</p> """ from bs4 import BeautifulSoup soup = BeautifulSoup(html) print(soup.p.string) #输出P标签的内容The Dormouse's story html = """ <html><head><title>The Dormouse's story</title></head> <body> <p class="title" name="dromouse"><b>The Dormouse's story</b></p> <p class="story">Once upon a time there were three little sisters; and their names were <a href="http://example.com/elsie" class="sister" id="link1"><!-- Elsie --></a>, <a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and <a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>; and they lived at the bottom of a well.</p> <p class="story">...</p> """ from bs4 import BeautifulSoup soup = BeautifulSoup(html) print(type(soup.head)) #这种格式可以进行嵌套<class 'bs4.element.Tag'> print(soup.head.title.strint) #soup 的嵌套 html = """ <html> <head> <title>The Dormouse's story</title> </head> <body> <p class="story"> Once upon a time there were three little sisters; and their names were <a href="http://example.com/elsie" class="sister" id="link1"> <span>Elsie</span> </a> <a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and <a href="http://example.com/tillie" class="sister" id="link3">Tillie</a> and they lived at the bottom of a well. </p> <p class="story">...</p> """ from bs4 import BeautifulSoup soup = BeautifulSoup(html) print(soup.p.contents) #输出P标签里的东西从<p>到</p> html = """ <html> <head> <title>The Dormouse's story</title> </head> <body> <p class="story"> Once upon a time there were three little sisters; and their names were <a href="http://example.com/elsie" class="sister" id="link1"> <span>Elsie</span> </a> <a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and <a href="http://example.com/tillie" class="sister" id="link3">Tillie</a> and they lived at the bottom of a well. </p> <p class="story">...</p> """ from bs4 import BeautifulSoup soup = BeautifulSoup(html) print(soup.p.children) for i, child in enumerate(soup.p.children): #i代表索引,children是p内的子节点 print(i, child) #父节点和祖先节点 html = """ <html> <head> <title>The Dormouse's story</title> </head> <body> <p class="story"> Once upon a time there were three little sisters; and their names were <a href="http://example.com/elsie" class="sister" id="link1"> <span>Elsie</span> </a> <a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and <a href="http://example.com/tillie" class="sister" id="link3">Tillie</a> and they lived at the bottom of a well. </p> <p class="story">...</p> """ from bs4 import BeautifulSoup soup = BeautifulSoup(html) print(soup.a.parent) #输出a标签的父亲节点包括自己 #兄弟节点 html = """ <html> <head> <title>The Dormouse's story</title> </head> <body> <p class="story"> Once upon a time there were three little sisters; and their names were <a href="http://example.com/elsie" class="sister" id="link1"> <span>Elsie</span> </a> <a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and <a href="http://example.com/tillie" class="sister" id="link3">Tillie</a> and they lived at the bottom of a well. </p> <p class="story">...</p> """ from bs4 import BeautifulSoup soup = BeautifulSoup(html) print(list(enumerate(soup.a.next_siblings))) print(list(enumerate(soup.a.previous_siblings))) #这有点不清楚 #标准选择器 html=''' <div class="panel"> <div class="panel-heading"> <h4>Hello</h4> </div> <div class="panel-body"> <ul class="list" id="list-1"> <li class="element">Foo</li> <li class="element">Bar</li> <li class="element">Jay</li> </ul> <ul class="list list-small" id="list-2"> <li class="element">Foo</li> <li class="element">Bar</li> </ul> </div> </div> ''' from bs4 import BeautifulSoup soup = BeautifulSoup(html) print(soup.find_all('ul'))#寻找所有<ul> print(type(soup.find_all('ul')[0])) html=''' <div class="panel"> <div class="panel-heading"> <h4>Hello</h4> </div> <div class="panel-body"> <ul class="list" id="list-1" name="elements"> <li class="element">Foo</li> <li class="element">Bar</li> <li class="element">Jay</li> </ul> <ul class="list list-small" id="list-2"> <li class="element">Foo</li> <li class="element">Bar</li> </ul> </div> </div> ''' from bs4 import BeautifulSoup soup = BeautifulSoup(html) print(soup.find_all(attrs={'id': 'list-1'}))#可以理解为寻找里面有id='list-1'的所有标签 print(soup.find_all(attrs={'name': 'elements'})) #获取属性 html=''' <div class="panel"> <div class="panel-heading"> <h4>Hello</h4> </div> <div class="panel-body"> <ul class="list" id="list-1"> <li class="element">Foo</li> <li class="element">Bar</li> <li class="element">Jay</li> </ul> <ul class="list list-small" id="list-2"> <li class="element">Foo</li> <li class="element">Bar</li> </ul> </div> </div> ''' from bs4 import BeautifulSoup soup = BeautifulSoup(html) for ul in soup.select('ul'): print(ul['id']) print(ul.attrs['id'])#可以进行嵌套 #CSS选择器 html=''' <div class="panel"> <div class="panel-heading"> <h4>Hello</h4> </div> <div class="panel-body"> <ul class="list" id="list-1"> <li class="element">Foo</li> <li class="element">Bar</li> <li class="element">Jay</li> </ul> <ul class="list list-small" id="list-2"> <li class="element">Foo</li> <li class="element">Bar</li> </ul> </div> </div> ''' from bs4 import BeautifulSoup soup = BeautifulSoup(html) print(soup.select('.panel .panel-heading'))#==class="panel"下class="panel-heading"及其内容 print(soup.select('ul li'))#找到ul 下的li标签以列表的形式返回内容 print(soup.select('#list-2 .element'))# #list==id="lisr-2" .element==class="element" 返回这个ID下的class print(type(soup.select('ul')[0])) #获取内容 html=''' <div class="panel"> <div class="panel-heading"> <h4>Hello</h4> </div> <div class="panel-body"> <ul class="list" id="list-1"> <li class="element">Foo</li> <li class="element">Bar</li> <li class="element">Jay</li> </ul> <ul class="list list-small" id="list-2"> <li class="element">Foo</li> <li class="element">Bar</li> </ul> </div> </div> ''' from bs4 import BeautifulSoup soup = BeautifulSoup(html) for li in soup.select('li'): print(li.get_text()) #获取li里面的内容 # Foo # Bar # Jay # Foo # Bar