一步一步构建一个爬虫实例，抓取糗事百科的段子
先不用beautifulsoup包来进行解析
第一步，访问网址并抓取源码
# -*- coding: utf-8 -*- # @Author: HaonanWu # @Date: 2016-12-22 16:16:08 # @Last Modified by: HaonanWu # @Last Modified time: 2016-12-22 20:17:13 import urllib import urllib2 import re import os if __name__ == '__main__': # 访问网址并抓取源码 url = 'http://www.qiushibaike.com/textnew/page/1/"htmlcode"># -*- coding: utf-8 -*- # @Author: HaonanWu # @Date: 2016-12-22 16:16:08 # @Last Modified by: HaonanWu # @Last Modified time: 2016-12-22 20:17:13 import urllib import urllib2 import re import os if __name__ == '__main__': # 访问网址并抓取源码 url = 'http://www.qiushibaike.com/textnew/page/1/"content">.*"htmlcode"># -*- coding: utf-8 -*- # @Author: HaonanWu # @Date: 2016-12-22 16:16:08 # @Last Modified by: HaonanWu # @Last Modified time: 2016-12-22 21:41:32 import urllib import urllib2 import re import os if __name__ == '__main__': # 访问网址并抓取源码 url = 'http://www.qiushibaike.com/textnew/page/1/"content">.*"htmlcode"># -*- coding: utf-8 -*- # @Author: HaonanWu # @Date: 2016-12-22 16:16:08 # @Last Modified by: HaonanWu # @Last Modified time: 2016-12-22 20:17:13 import urllib import urllib2 import re import os if __name__ == '__main__': # 访问网址并抓取源码 path = './qiubai' if not os.path.exists(path): os.makedirs(path) user_agent = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36' headers = {'User-Agent':user_agent} regex = re.compile('<div class="content">.*"htmlcode"># -*- coding: utf-8 -*- # @Author: HaonanWu # @Date: 2016-12-22 16:16:08 # @Last Modified by: HaonanWu # @Last Modified time: 2016-12-22 21:34:02 import urllib import urllib2 import re import os from bs4 import BeautifulSoup if __name__ == '__main__': url = 'http://www.qiushibaike.com/textnew/page/1/"div", class_="content") for item in items: try: content = item.span.string except AttributeError as e: print e exit() if content: print content + "\n"这是用BeautifulSoup去抓取书本以及其价格的代码
可以通过对比得出到bs4对标签的读取以及标签内容的读取
（因为我自己也没有学到这一部分，目前只能依葫芦画瓢地写）# -*- coding: utf-8 -*- # @Author: HaonanWu # @Date: 2016-12-22 20:37:38 # @Last Modified by: HaonanWu # @Last Modified time: 2016-12-22 21:27:30 import urllib2 import urllib import re from bs4 import BeautifulSoup url = "https://www.packtpub.com/all" try: html = urllib2.urlopen(url) except urllib2.HTTPError as e: print e exit() soup_packtpage = BeautifulSoup(html, 'lxml') all_book_title = soup_packtpage.find_all("div", class_="book-block-title") price_regexp = re.compile(u"\s+\$\s\d+\.\d+") for book_title in all_book_title: try: print "Book's name is " + book_title.string.strip() except AttributeError as e: print e exit() book_price = book_title.find_next(text=price_regexp) try: print "Book's price is "+ book_price.strip() except AttributeError as e: print e exit() print ""以上全部为本篇文章的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。