一、BeautifulSoup4的安裝
方法一：cmd->easy_install BeautifulSoup
方法二：從http://www./software/BeautifulSoup/bs4/download/
下載->cmd->進(jìn)入下載的文件目錄->python
setuyp.py install
二、 BeautifulSoup4的使用
1、導(dǎo)入
from bs4 import BeautifulSoup
注意：要是BeautifulSoup的版本為3.x，則導(dǎo)入方式為：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.
...
"""
代碼：
from bs4 import BeautifulSoup
soup = BeautifulSoup(html_doc)
接下來(lái)可以開(kāi)始使用各種功能
soup.X
(X為任意標(biāo)簽，返回整個(gè)標(biāo)簽，包括標(biāo)簽的屬性，內(nèi)容等）
如：soup.title
#
soup.p
#
The Dormouse's story
soup.a
（注：僅僅返回第一個(gè)結(jié)果）
# Elsie
soup.find_all('a') （find_all 可以返回所有）
# [Elsie,
# Lacie,
# Tillie]
find還可以按屬性查找
soup.find(id="link3")
# Tillie
要取某個(gè)標(biāo)簽的某個(gè)屬性，可用函數(shù)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.
# ...
如果是打開(kāi)html文件，語(yǔ)句可用：
soup =
BeautifulSoup(open("index.html"))
BeautifulSoup中的Object
tag （對(duì)應(yīng)html中的標(biāo)簽）
tag.attrs
(以字典形式返回tag的所有屬性）
可以直接對(duì)tag的屬性進(jìn)行增、刪、改，跟操作字典一樣
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為標(biāo)簽，可返回標(biāo)簽的內(nèi)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']
解決解析網(wǎng)頁(yè)出現(xiàn)亂碼問(wèn)題：
import
urllib2
2
from
BeautifulSoup import BeautifulSoup
3
4
page =
urllib2.urlopen('http://www.');
5
soup =
BeautifulSoup(page,fromEncoding="gb18030")
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