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Python 网页解析器BeautifulSoup示例使用

2016-05-12 11:24 513 查看
Beautiful Soup 是一个可以从HTML或XML文件中提取数据的Python库.它能够通过你喜欢的转换器实现惯用的文档导航,查找,修改文档的方式.Beautiful
Soup会帮你节省数小时甚至数天的工作时间。

接下来，快事使用一些编程范例，使得尽快熟悉BeautifulSoup使用方法：

# coding:utf8
import re
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', from_encoding='utf-8')

print '获取的所有链接'
links = soup.find_all('a')

for link in links:
print link.name, link['href'], link.get_text()

print '获取lacie的链接'
link_node = soup.find('a', href='http://example.com/lacie')
print link_node.name, link_node['href'], link_node.get_text()

print '正则匹配'
link_node = soup.find('a', href=re.compile(r"ill"))
print link_node.name, link_node['href'], link_node.get_text()

print '获取p段落文字'
p_note = soup.find('p', class_="title")
print p_note.name, p_note.get_text()



运行结果：
获取的所有链接
a http://example.com/elsie Elsie
a http://example.com/lacie Lacie
a http://example.com/tillie Tillie
获取lacie的链接
a http://example.com/lacie Lacie
正则匹配
a http://example.com/tillie Tillie
获取p段落文字
p The Dormouse's story
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