python使用BeautifulSoup分析网页信息的方法

本文实例讲述了python使用BeautifulSoup分析网页信息的方法。分享给大家供大家参考。具体如下：

这段python代码查找网页上的所有链接，分析所有的span标签，并查找class包含titletext的span的内容

#import the library used to query a website

import urllib2
#specify the url you want to query

url = "http://www.python.org"
#Query the website and return the html to the variable 'page'

page = urllib2.urlopen(url)
#import the Beautiful soup functions to parse the data returned from the website

from BeautifulSoup import BeautifulSoup
#Parse the html in the 'page' variable, and store it in Beautiful Soup format

soup = BeautifulSoup(page)
#to print the soup.head is the head tag and soup.head.title is the title tag

print soup.head

print soup.head.title
#to print the length of the page, use the len function

print len(page)
#create a new variable to store the data you want to find.

tags = soup.findAll('a')
#to print all the links

print tags
#to get all titles and print the contents of each title

titles = soup.findAll('span', attrs = { 'class' : 'titletext' })

for title in allTitles:

print title.contents

希望本文所述对大家的Python程序设计有所帮助。