Python中使用BeautifulSoup做网页解析

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BeautifulSoup为第三方库，用于从HTML或XML中提取数据
下载地址：http://www.crummy.com/software/BeautifulSoup/

linux中安装BeautifulSoup：

解压后，进入beautifulsoup4-4.3.0目录;
在命令行输入 python setup.py install或者sudo python setup.py install;
输入python，进入python模块;
输入from bs4 import BeautifulSoup检测是否成功。

'''Created on 2016-4-15https://www.crummy.com/software/BeautifulSoup/bs4/doc/index.html#beautiful-soup-4-2-0@author: developer'''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>"""from bs4 import BeautifulSoupimport re#根据HTML网页字符串创建BeautifulSoup对象'''html_doc                  #HTML文档字符串'html.parser'             #HTML解析器from_encoding='utf-8'      #HTML文档的编码'''soup = BeautifulSoup(html_doc, 'html.parser',from_encoding='utf-8')########################################print("获取所有链接")#查找所有标签为a的节点links = soup.find_all('a')#获取查找到的节点的标签名称 node.name#获取查找到的a节点的href属性 node['href']#获取查找到的a节点的链接文字  node.get_text()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_node = soup.find('p', class_="title")      ##class为python中的关键字，所以加了下划线，避免冲突print(p_node.name,  p_node.get_text())

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