本文实例讲述了python html解析器beautifulsoup用法。分享给大家供大家参考，具体如下：
beautifulsoup简介
我们知道，python拥有出色的内置html解析器模块——htmlparser，然而还有一个功能更为强大的html或xml解析工具——beautifulsoup（美味的汤），它是一个第三方库。简单来说，beautifulsoup最主要的功能是从网页抓取数据。本文我们来感受一下beautifulsoup的优雅而强大的功能吧！
beautifulsoup安装
beautifulsoup3 目前已经停止开发，推荐在现在的项目中使用beautifulsoup4，不过它已经被移植到bs4了，也就是说导入时我们需要 import bs4 。可以利用 pip 或者 easy_install 两种方法来安装。下面采用pip安装。
|
1
2
|
pip install beautifulsoup4pip install lxml |
建议同时安装"lxml"模块，beautifulsoup支持python标准库中的html解析器（htmlparser），还支持一些第三方的解析器，如果我们不安装它，则 python 会使用 python默认的解析器，lxml 解析器更加强大，速度更快，推荐安装。
创建对象
安装后，创建对象：
|
1
|
soup = beautifulsoup(markup='html文件', 'lxml') |
格式化输出：
|
1
|
soup.prettify() |
beautifulsoup四大对象类型
beautifulsoup将复杂html文档转换成一个复杂的树形结构,每个节点都是python对象,所有对象可以归纳为4种:
- tag（标签）
- navigablestring（内容）
- beautifulsoup（文档）
- comment（注释）
1.tag类型
即html的整个标签，如获取<title>标签：
|
1
2
|
print soup.title#<title>the dormouse's story</title> |
tag有两个重要属性：name，attrs。
name
即html的标签名称：
|
1
2
3
4
|
print soup.name#[document]print soup.head.name#head |
attrs
即html的标签属性字典：
|
1
2
|
print soup.p.attrs#{'class': ['title'], 'name': 'dromouse'} |
如果想要单独获取某个属性：
|
1
2
|
print soup.p['class']#['title'] |
2.navigablestring类型
既然我们已经得到了整个标签，那么问题来了，我们要想获取标签内部的文字内容怎么办呢？很简单，用 string 即可：
|
1
2
|
print soup.p.string#the dormouse's story |
3.beautifulsoup类型
beautifulsoup 对象表示的是一个文档的全部内容.：
|
1
2
|
print soup.name# [document] |
4.comment类型
html的注释内容，注意的是，不包含注释符号。我们首先判断它的类型，是否为 comment 类型，然后再进行其他操作，如打印输出：
|
1
2
3
|
if type(soup.a.string)==bs4.element.comment: print soup.a.string#<!-- elsie --> |
遍历文档树
1.子节点
contents
获取所有子节点，返回列表：
|
1
2
|
print soup.head.contents#[<title>the dormouse's story</title>] |
children
获取所有子节点，返回列表生成器：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
|
print soup.head.children#<listiterator object at 0x7f71457f5710>## 需要遍历for child in soup.body.children: print child## 结果<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 class="sister" href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link1"><!-- elsie --></a>,<a class="sister" href="http://example.com/lacie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link2">lacie</a> and<a class="sister" href="http://example.com/tillie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link3">tillie</a>;and they lived at the bottom of a well.</p><p class="story">...</p> |
2.节点内容
string
返回单个文本内容。如果一个标签里面没有标签了，那么 string 就会返回标签里面的内容。如果标签里面只有唯一的一个标签了，那么 string 也会返回最里面的内容。如果tag包含了多个子节点,tag就无法确定，string 方法应该调用哪个子节点的内容，string 的输出结果是 none。例如：
|
1
2
3
4
5
6
|
print soup.head.stringprint soup.title.string#the dormouse's story#the dormouse's storyprint soup.html.string# none |
strings
返回多个文本内容，且包含空行和空格。
stripped_strings
返回多个文本内容，且不包含空行和空格：
|
1
2
3
4
5
6
7
8
9
10
11
12
|
for string in soup.stripped_strings: print(repr(string)) # u"the dormouse's story" # u"the dormouse's story" # u'once upon a time there were three little sisters; and their names were' # u'elsie' # u',' # u'lacie' # u'and' # u'tillie' # u';\nand they lived at the bottom of a well.' # u'...' |
get_text()方法
返回当前节点和子节点的文本内容。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
|
from bs4 import beautifulsouphtml_doc = """<html><head><title>the dormouse's story</title></head><body> <p class="title"><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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="sister1" id="link1">elsie</a>, <a href="http://example.com/lacie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="sister2" id="link2">lacie</a> and <a href="http://example.com/tillie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="sister3" id="link3">tillie</a>; and they lived at the bottom of a well. </p> <p class="story">...</p></body></html>"""soup = beautifulsoup(markup=html_doc,features='lxml')node_p_text=soup.find('p',class_='story').get_text() # 注意class_带下划线print(node_p_text)# 结果once upon a time there were three little sisters; and their names were elsie, lacie and tillie; and they lived at the bottom of a well. |
3.父节点
parent
返回某节点的直接父节点：
|
1
2
3
|
p = soup.pprint p.parent.name#body |
parents
返回某节点的所有父辈及以上辈的节点：
|
1
2
3
4
5
6
7
8
|
content = soup.head.title.stringfor parent in content.parents: print parent.name## 结果titleheadhtml[document] |
4.兄弟节点
next_sibling
next_sibling 属性获取该节点的下一个兄弟节点，结果通常是字符串或空白，因为空白或者换行也可以被视作一个节点。
previous_sibling
previous_sibling 属性获取该节点的上一个兄弟节点。
|
1
2
3
4
5
6
7
8
9
10
11
|
print soup.p.next_sibling# 实际该处为空白print soup.p.prev_sibling#none 没有前一个兄弟节点，返回 noneprint soup.p.next_sibling.next_sibling#<p class="story">once upon a time there were three little sisters; and their names were#<a class="sister" href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link1"><!-- elsie --></a>,#<a class="sister" href="http://example.com/lacie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link2">lacie</a> and#<a class="sister" href="http://example.com/tillie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link3">tillie</a>;#and they lived at the bottom of a well.</p>#下一个节点的下一个兄弟节点是我们可以看到的节点 |
next_siblings、previous_siblings
迭代获取全部兄弟节点。
5.前后节点
next_element、previous_element
不是针对于兄弟节点，而是在于所有节点，不分层次的前一个和后一个节点。
next_elements、previous_elements
迭代获取所有前和后节点。
搜索文档树
1.find_all(name=none, attrs={}, recursive=true, text=none, limit=none, **kwargs)
find_all()方法搜索当前tag的所有tag子节点，并判断是否符合过滤器的条件。
参数说明
name参数
name参数很强大，可以传多种方式的参数，查找所有名字为 name 的tag，字符串对象会被自动忽略掉。
（a）传标签名
最简单的过滤器是标签名。在搜索方法中传入一个标签名参数，beautifulsoup会查找与标签名完整匹配的内容，下面的例子用于查找文档中所有的<a>标签：
|
1
2
|
print soup.find_all('a')#[<a class="sister" href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link1"><!-- elsie --></a>, <a class="sister" href="http://example.com/lacie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link2">lacie</a>, <a class="sister" href="http://example.com/tillie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link3">tillie</a>] |
返回结果列表中的元素仍然是beautifulsoup对象。
（b）传正则表达式
如果传入正则表达式作为参数，beautifulsoup会通过正则表达式的 match() 来匹配内容。下面例子中找出所有以b开头的标签,这表示<body>和<b>标签都应该被找到：
|
1
2
3
4
5
|
import refor tag in soup.find_all(re.compile("^b")): print(tag.name)# body# b |
（c）传列表
如果传入列表参数，beautifulsoup会将与列表中任一元素匹配的内容返回。下面代码找到文档中所有<a>标签和<b>标签：
|
1
2
3
4
5
|
soup.find_all(["a", "b"])# [<b>the dormouse's story</b>,# <a class="sister" href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link1">elsie</a>,# <a class="sister" href="http://example.com/lacie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link2">lacie</a>,# <a class="sister" href="http://example.com/tillie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link3">tillie</a>] |
（d）传true
true 可以匹配任何值，下面代码查找到所有的tag，但是不会返回字符串节点：
|
1
2
3
4
5
6
7
8
9
10
11
|
for tag in soup.find_all(true): print(tag.name)# html# head# title# body# p# b# p# a# a |
（e）传函数
如果没有合适过滤器，那么还可以定义一个方法，方法只接受一个元素参数。如果这个方法返回 true 表示当前元素匹配并且被找到，如果不是则反回 false：
|
1
2
3
4
5
6
|
def has_class_but_no_id(tag): return tag.has_attr('class') and not tag.has_attr('id')soup.find_all(has_class_but_no_id)# [<p class="title"><b>the dormouse's story</b></p>,# <p class="story">once upon a time there were...</p>,# <p class="story">...</p>] |
keyword参数
注意的是，如果一个指定名字的参数不是搜索内置的参数名，搜索时会把该参数当作指定名字tag的属性来搜索，如果包含一个名字为 id 的参数,beautifulsoup会搜索每个tag的”id”属性：
|
1
2
|
soup.find_all(id='link2')# [<a class="sister" href="http://example.com/lacie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link2">lacie</a>] |
如果传入 href 参数，beautiful soup会搜索每个tag的"href"属性：
|
1
2
|
soup.find_all(href=re.compile("elsie"))# [<a class="sister" href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link1">elsie</a>] |
使用多个指定名字的参数可以同时过滤tag的多个属性:
|
1
2
|
soup.find_all(href=re.compile("elsie"), id='link1')# [<a class="sister" href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link1">three</a>] |
在这里我们想用 class 过滤，不过 class 是 python 的关键词，这怎么办？加个下划线就可以：
|
1
2
3
4
|
soup.find_all("a", class_="sister")# [<a class="sister" href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link1">elsie</a>,# <a class="sister" href="http://example.com/lacie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link2">lacie</a>,# <a class="sister" href="http://example.com/tillie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link3">tillie</a>] |
attrs参数
有些tag属性在搜索不能使用,比如html5中的 " data-* " 自定义属性：
|
1
2
3
4
5
6
|
data_soup = beautifulsoup('<div data-foo="value">foo!</div>')data_soup.find_all(data-foo="value")# syntaxerror: keyword can't be an expression## 但是可以通过 find_all() 方法的 attrs 参数定义一个字典参数来搜索包含特殊属性的tagdata_soup.find_all(attrs={"data-foo": "value"})# [<div data-foo="value">foo!</div>] |
text参数
通过 text 参数可以搜搜文档中的字符串内容。与 name 参数的可选值一样，text 参数接受字符串 、正则表达式 、列表、true。
|
1
2
3
4
5
6
|
soup.find_all(text="elsie")# [u'elsie']soup.find_all(text=["tillie", "elsie", "lacie"])# [u'elsie', u'lacie', u'tillie']soup.find_all(text=re.compile("dormouse")) # 模糊查找[u"the dormouse's story", u"the dormouse's story"] |
limit参数
find_all() 方法返回全部的搜索结构，如果文档树很大那么搜索会很慢。如果我们不需要全部结果，可以使用 limit 参数限制返回结果的数量。效果与sql中的limit关键字类似，当搜索到的结果数量达到 limit 的限制时，就停止搜索返回结果。
|
1
2
3
|
soup.find_all("a", limit=2)# [<a class="sister" href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link1">elsie</a>,# <a class="sister" href="http://example.com/lacie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link2">lacie</a>] |
recursive参数
调用tag的 find_all() 方法时，beautifulsoup会检索当前tag的所有子孙节点，如果只想搜索tag的直接子节点，可以使用参数 recursive=false。
|
1
2
3
4
|
soup.html.find_all("title")# [<title>the dormouse's story</title>]soup.html.find_all("title", recursive=false)# [] |
2.find( name , attrs , recursive , text , **kwargs )
它与 find_all() 方法唯一的区别是 find_all() 方法的返回结果是值包含一个元素的列表，而 find() 方法直接返回结果。
3.find_parents() 和 find_parent()
find_all() 和 find() 只搜索当前节点的所有子节点，孙子节点等。find_parents() 和 find_parent() 用来搜索当前节点的父辈节点，搜索方法与普通tag的搜索方法相同，搜索文档搜索文档包含的内容。
4.find_next_siblings() 和 find_next_sibling()
这2个方法通过 .next_siblings 属性对当 tag 的所有后面解析的兄弟 tag 节点进行迭代， find_next_siblings() 方法返回所有符合条件的后面的兄弟节点，find_next_sibling() 只返回符合条件的后面的第一个tag节点。
5.find_previous_siblings() 和 find_previous_sibling()
这2个方法通过 .previous_siblings 属性对当前 tag 的前面解析的兄弟 tag 节点进行迭代， find_previous_siblings() 方法返回所有符合条件的前面的兄弟节点，find_previous_sibling() 方法返回第一个符合条件的前面的兄弟节点。
6.find_all_next() 和 find_next()
这2个方法通过 .next_elements 属性对当前 tag 的之后的 tag 和字符串进行迭代， find_all_next() 方法返回所有符合条件的节点， find_next() 方法返回第一个符合条件的节点。
7.find_all_previous() 和 find_previous()
这2个方法通过 .previous_elements 属性对当前节点前面的 tag 和字符串进行迭代，find_all_previous() 方法返回所有符合条件的节点， find_previous()方法返回第一个符合条件的节点。
css选择器
我们在写 css 时，标签名不加任何修饰，类名前加点，id名前加 #，在这里我们也可以利用类似的方法来筛选元素，用到的方法是 soup.select()，返回类型是 list。
通过标签名查找
|
1
2
3
4
5
6
|
print soup.select('title')#[<title>the dormouse's story</title>]print soup.select('a')#[<a class="sister" href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link1"><!-- elsie --></a>, <a class="sister" href="http://example.com/lacie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link2">lacie</a>, <a class="sister" href="http://example.com/tillie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link3">tillie</a>]print soup.select('b')#[<b>the dormouse's story</b>] |
通过类名查找
|
1
2
|
print soup.select('.sister')#[<a class="sister" href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link1"><!-- elsie --></a>, <a class="sister" href="http://example.com/lacie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link2">lacie</a>, <a class="sister" href="http://example.com/tillie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link3">tillie</a>] |
通过 id 名查找
|
1
2
|
print soup.select('#link1')#[<a class="sister" href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link1"><!-- elsie --></a>] |
组合查找
组合查找即和写 class 文件时，标签名与类名、id名进行的组合原理是一样的，例如查找 p 标签中，id 等于 link1的内容，二者需要用空格分开。
|
1
2
|
print soup.select('p #link1')#[<a class="sister" href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link1"><!-- elsie --></a>] |
直接子标签查找：
|
1
2
|
print soup.select("head > title")#[<title>the dormouse's story</title>] |
属性查找
查找时还可以加入属性元素，属性需要用中括号括起来，注意属性和标签属于同一节点，所以中间不能加空格，否则会无法匹配到。
|
1
2
3
4
|
print soup.select('a[class="sister"]')#[<a class="sister" href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link1"><!-- elsie --></a>, <a class="sister" href="http://example.com/lacie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link2">lacie</a>, <a class="sister" href="http://example.com/tillie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link3">tillie</a>]print soup.select('a[href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ]')#[<a class="sister" href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link1"><!-- elsie --></a>] |
同样，属性仍然可以与上述查找方式组合，不在同一节点的空格隔开，同一节点的不加空格：
|
1
2
|
print soup.select('p a[href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ]')#[<a class="sister" href="http://example.com/elsie" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="link1"><!-- elsie --></a>] |
以上的 select 方法返回的结果都是列表形式，可以遍历形式输出，然后用 string或get_text() 方法来获取它的内容：
|
1
2
3
4
5
|
soup = beautifulsoup(html, 'lxml')print type(soup.select('title'))print soup.select('title')[0].get_text()for title in soup.select('title'): print title.get_text() |
希望本文所述对大家python程序设计有所帮助。
原文链接：https://www.cnblogs.com/wcwnina/p/8093987.html
