爬虫 正则表达式
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库文件 re
符号
- . : 匹配任意字符,换行符\n除外
- :匹配前一个字符0次或无限次
- ? :匹配前一个字符0次或1次
- .*:贪心算法
- .*?:非贪心算法
- ():括号内的数据作为结果返回
方法
- findall: 匹配所有符合规律的内容,返回包含结果的列表
- Search:匹配并提取第一个符合规律的内容,返回一个正则表达式对象(object)
- Sub:替换符合规律的内容,返回替换后的值
- Search在找到要找的信息后就不会再向下找
知识点讲解
import re from re import findall, search, S # 不推荐,到时候可能认不出来是哪个包的 *************************************** # .的使用举例 a = 'xy123' b = re.findall('x...', a) print b # ['xy12'] *************************************** # *的使用举例 a = 'xyxy123' b = re.findall('x*',a) print b # ['x', '', 'x', '', '', '', '', ''] *************************************** # ?的使用举例 a = 'xy123' b = re.findall('x?', a) print b # ['x', '', '', '', '', ''] '''上面的内容全部都是只需要了解即可,需要掌握的只有下面这一种组合方式(.*?)''' secret_code = 'hadkfalifexxIxxfasdjifja134xxlovexx23345sdfxxyouxx8dfse' *************************************** # .*的使用举例 b = re.findall('xx.*xx', secret_code) print b # ['xxIxxfasdjifja134xxlovexx23345sdfxxyouxx'] *************************************** # .*?的使用举例 c = re.findall('xx.*?xx', secret_code) print c # ['xxIxx', 'xxlovexx', 'xxyouxx'] *************************************** # (.*?)使用括号与不使用括号的差别 d = re.findall('xx(.*?)xx', secret_code) print d # ['I', 'love', 'you'] for each in d: print each # I love you *************************************** # 有换行的情况下匹配 s = '''sdfxxhello xxfsdfxxworldxxasdf''' d = re.findall('xx(.*?)xx', s) print d # ['fsdf'] d = re.findall('xx(.*?)xx', s, re.S) print d # ['hello\n', 'world'] *************************************** # 对比findall与search的区别 s2 = 'asdfxxIxx123xxlovexxdfd' f = re.search('xx(.*?)xx123xx(.*?)xx', s2).group(2) print f # love 匹配的是第几个括号 f2 = re.findall('xx(.*?)xx123xx(.*?)xx', s2) print f2[0][1] # love findall返回的是列表嵌套元组 *************************************** # sub的使用举例 s = '123rrrrr123' output = re.sub('123(.*?)123', '123%d123' % 789, s) print output # 123789123 找到并匹配 *************************************** # 不推荐使用compile 源代码里已经用了 pattern = 'xx(.*?)xx' new_pattern = re.compile(pattern, re.S) output = re.findall(new_pattern, secret_code) print output *************************************** # \d+匹配数字 a = 'asdfasf1234567fasd555fas' b = re.findall('(\d+)', a) print b
测试用例
爬取简单文本
- text.txt
<html> <head> <title>极客学院爬虫测试</title> </head> <body> <div class="topic"><a href="http://jikexueyuan.com/welcome.html">欢迎参加《Python定向爬虫入门课程》</a> <div class="list"> <ul> <li><a href="http://jikexueyuan.com/1.html">这是第一条</a></li> <li><a href="http://jikexueyuan.com/2.html">这是第二条</a></li> <li><a href="http://jikexueyuan.com/3.html">这是第三条</a></li> </ul> </div> </div> </body> </html>
- 对上面的文本进行爬取
import re old_url = 'http://www.jikexueyuan.com/course/android/?pageNum=2' total_page = 20 f = open('text.txt', 'r') html = f.read() f.close() **************************************************** # 爬取标题 title = re.search('<title>(.*?)</title>', html, re.S).group(1) print title # 极客学院爬虫测试 **************************************************** # 爬取链接 links = re.findall('href="(.*?)"', html, re.S) for each in links: print each **************************************************** # 抓取部分文字,先大再小 text_fied = re.findall('<ul>(.*?)</ul>', html, re.S)[0] the_text = re.findall('">(.*?)</a>', text_fied, re.S) for every_text in the_text: every_text.encoding = 'utf-8' print every_text **************************************************** # sub实现翻页 for i in range(2, total_page + 1): new_link = re.sub('pageNum=\d+', 'pageNum=%d' % i, old_url, re.S) print new_link
爬取图片
- 一段网页源代码
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src="http://s1.jikexueyuan.com/current/static/images/close_vip.png" mid="1" oid="638" s="1" clsy="" clsn="" oper="favorites" id="do_favorit" style="display:none;" /></div><div class="lesson-infor"><h2 class="lesson-info-h2"><a href="http://www.jikexueyuan.com/course/638.html" target="_blank">友盟社会化组件 Social-iOS SDK</a></h2><p>本课程讲解友盟社会化组件的基本功能和第三方平台注册事项,并且通过代码直接演示 Social...</p><div class="timeandicon"><div class="cf"><dl><dd class="mar-b8"><i class="time-icon"></i><em>3课时 20分钟</em></dd><dd class="zhongji"><i class="xinhao-icon"></i><em>初级</em></dd></dl></div><div class="cf"><div class="lessonicon-box"><a href="http://www.jikexueyuan.com/course/ios/"><img width="16" src="http://a1.jikexueyuan.com/home/201411/04/3567/5457df3530e14.png" alt="iOS" title="iOS" /></a></div></div></div></div></li><li deg="" courseid="639"><div class="lessonimg-box"><a href="http://www.jikexueyuan.com/course/639.html" target="_blank" ><img src="http://a1.jikexueyuan.com/home/201503/26/f432/551370b80ef48.jpg" 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href="http://www.jikexueyuan.com/course/364.html" target="_blank" ><img src="http://a1.jikexueyuan.com/home/201411/14/9418/546570c084e0f.jpg" class="lessonimg" title="使用Visual Studio 2015开发Android应用" alt="使用Visual Studio 2015开发Android应用" /><div class="lessonplay"><i class="playericon"></i></div></a><img class="cancel-favorites cancel-stop user-action" src="http://s1.jikexueyuan.com/current/static/images/close_vip.png" mid="1" oid="364" s="1" clsy="" clsn="" oper="favorites" id="do_favorit" style="display:none;" /></div><div class="lesson-infor"><h2 class="lesson-info-h2"><a href="http://www.jikexueyuan.com/course/364.html" target="_blank">使用Visual Studio 2015开发Android应用</a></h2><p>本课讲解2014年微软 Connect(); 在线开发者大会上发布的新功能,.Net 开源...</p><div class="timeandicon"><div class="cf"><dl><dd class="mar-b8"><i class="time-icon"></i><em>4课时 14分钟</em></dd><dd class="zhongji"><i class="xinhao-icon"></i><em>初级</em></dd></dl></div><div class="cf"><div class="lessonicon-box"><a 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- 爬取上面的代码中的图片
#-*-coding:utf8-*- import re import requests #读取源代码文件 f = open('source.txt','r') html = f.read() f.close() #匹配图片网址 pic_url = re.findall('img src="(.*?)" class="lessonimg"',html,re.S) i = 0 for each in pic_url: print 'now downloading:' + each pic = requests.get(each) fp = open('pic\\' + str(i) + '.jpg','wb') fp.write(pic.content) fp.close() i += 1
- 爬取异步加载的网站
import requests import re # url = 'https://www.crowdfunder.com/browse/deals' url = 'https://www.crowdfunder.com/browse/deals&template=false' html = requests.get(url) print html.content # 注意这里的page后面跟的数字需要放到引号里面。 # 那个网站好像没有异步加载的功能了,所以post和get功能一样了 data = { 'entities_only': 'true', 'page': '2' } html_post = requests.post(url, data=data) title = re.findall('"card-title">(.*?)</div>', html_post.text, re.S) for each in title: print each
爬取网站课程信息 有bug
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#-*_coding:utf8-*- import requests import re import sys reload(sys) sys.setdefaultencoding("utf-8") # 上面三行是为了解决windows命令行默认是GDK编码,而网站是UTF-8 class spider(object): def __init__(self): print u'开始爬取内容。。。' #getsource用来获取网页源代码 def getsource(self,url): html = requests.get(url) return html.text #changepage用来生产不同页数的链接 def changepage(self,url,total_page): now_page = int(re.search('pageNum=(\d+)',url,re.S).group(1)) page_group = [] for i in range(now_page,total_page+1): link = re.sub('pageNum=\d+','pageNum=%s'%i,url,re.S) page_group.append(link) return page_group #geteveryclass用来抓取每个课程块的信息 def geteveryclass(self,source): everyclass = re.findall('(<li deg="".*?</li>)',source,re.S) return everyclass #getinfo用来从每个课程块中提取出我们需要的信息 def getinfo(self,eachclass): info = {} info['title'] = re.search('target="_blank">(.*?)</a>',eachclass,re.S).group(1) info['content'] = re.search('</h2><p>(.*?)</p>',eachclass,re.S).group(1) timeandlevel = re.findall('<em>(.*?)</em>',eachclass,re.S) info['classtime'] = timeandlevel[0] info['classlevel'] = timeandlevel[1] info['learnnum'] = re.search('"learn-number">(.*?)</em>',eachclass,re.S).group(1) return info #saveinfo用来保存结果到info.txt文件中 def saveinfo(self,classinfo): f = open('info.txt','a') for each in classinfo: f.writelines('title:' + each['title'] + '\n') f.writelines('content:' + each['content'] + '\n') f.writelines('classtime:' + each['classtime'] + '\n') f.writelines('classlevel:' + each['classlevel'] + '\n') f.writelines('learnnum:' + each['learnnum'] +'\n\n') f.close() if __name__ == '__main__': classinfo = [] url = 'http://www.jikexueyuan.com/course/?pageNum=1' jikespider = spider() all_links = jikespider.changepage(url,20) for link in all_links: print u'正在处理页面:' + link html = jikespider.getsource(link) everyclass = jikespider.geteveryclass(html) for each in everyclass: info = jikespider.getinfo(each) classinfo.append(info) jikespider.saveinfo(classinfo)
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