一、BeautifulSoup4的安装
方法一：cmd->easy_install BeautifulSoup
方法二：从http://www./software/BeautifulSoup/bs4/download/
下载->cmd->进入下载的文件目录->python
setuyp.py install
二、 BeautifulSoup4的使用
1、导入
from bs4 import BeautifulSoup
注意：要是BeautifulSoup的版本为3.x，则导入方式为：from BeautifulSoup import
BeautifulSoup
2、example
html文件：
html_doc = """
The Dormouse's story
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.
...
"""
代码：
from bs4 import BeautifulSoup
soup = BeautifulSoup(html_doc)
接下来可以开始使用各种功能
soup.X
(X为任意标签，返回整个标签，包括标签的属性，内容等）
如：soup.title
#
soup.p
#
The Dormouse's story
soup.a
（注：仅仅返回第一个结果）
# Elsie
soup.find_all('a') （find_all 可以返回所有）
# [Elsie,
# Lacie,
# Tillie]
find还可以按属性查找
soup.find(id="link3")
# Tillie
要取某个标签的某个属性，可用函数有 find_all,get
for link in
soup.find_all('a'):
print(link.get('href'))
#
http:///elsie
#
http:///lacie
#
http:///tillie
要取html文件中的所有文本，可使用get_text()
print(soup.get_text())
# The
Dormouse's story
# The
Dormouse's story
# 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.
# ...
如果是打开html文件，语句可用：
soup =
BeautifulSoup(open("index.html"))
BeautifulSoup中的Object
tag （对应html中的标签）
tag.attrs
(以字典形式返回tag的所有属性）
可以直接对tag的属性进行增、删、改，跟操作字典一样
tag['class']
= 'verybold'
tag['id'] =
1
tag
#
<blockquote class="verybold"
id="1">Extremely
bold</blockquote>
del
tag['class']
del
tag['id']
tag
#
<blockquote>Extremely
bold</blockquote>
tag['class']
# KeyError:
'class'
print(tag.get('class'))
# None
X.contents
(X为标签，可返回标签的内容）
eg.
head_tag =
soup.head
head_tag
#
<head><title>The
Dormouse's
story</title></head>
head_tag.contents
[<title>The Dormouse's
story</title>]
title_tag =
head_tag.contents[0]
title_tag
#
<title>The Dormouse's
story</title>
title_tag.contents
# [u'The
Dormouse's story']
解决解析网页出现乱码问题：
import
urllib2
2
from
BeautifulSoup import BeautifulSoup
3
4
page =
urllib2.urlopen('http://www.');
5
soup =
BeautifulSoup(page,fromEncoding="gb18030")
6
|
