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beautifulsoup简单用法

2017-03-16 12:14 197 查看

原文地址

http://www.cnblogs.com/yupeng/p/3362031.html

这篇文章讲的也很全

http://www.cnblogs.com/twinsclover/archive/2012/04/26/2471704.html

稍微研究了下bs4这个库，运行了下都还好用，就是解析html的各种结构，和xml的elementTree解析库是类似的，使用起来差不多。

可以直接调试，用来熟悉其用法

# coding=utf-8
#
from bs4 import BeautifulSoup

html_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" 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>
"""

soup = BeautifulSoup(html_doc,'html.parser')
# print soup.title
# print soup.title.name
# print soup.title.string
# print soup.p
# print soup.a
# print soup.find_all('a')
# a=soup.find_all('a')
# print len(a)
# print soup.find_all('p')#返回类似数组的结构
# p=soup.find_all('p')
# print len(p)
# print soup.find(id='link3')

# print soup.get_text()#返回整个的文本
# print soup.p.get_text()#根据解析的节点来
# for i in soup.find_all('p'):
# print i.get_text()
# print i.contents
# print soup.a['href'],soup.a['class'],soup.a['id'],soup.a.text#注意单节点的每个内容都获取到了
# print soup.html,soup.head,soup.body#s整体，头，身体，全部的结构
# print soup.p.contents,soup.head.contents#列表形式返回子内容
# for i in list(soup.head.children):#不需要知道子节点的名称，迭代遍历子内容
#     print i,
# print soup.a.parent#向上查找，parents是查找所有的
# for i in soup.html.parents:
#     print i,len(i)
# print soup.a.parent
# print soup.find_all(class_="sister")
print soup.find_all('a',limit=1)#限制个数

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