爬虫正则表达式-369IT编程

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爬虫正则表达式

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 refrom 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 = '''sdfxxhelloxxfsdfxxworldxxasdf'''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 = repile(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=".html">欢迎参加《Python定向爬虫入门课程》</a><div class="list"><ul><li><a href=".html">这是第一条</a></li><li><a href=".html">这是第二条</a></li><li><a href=".html">这是第三条</a></li></ul></div></div></body></html>

对上面的文本进行爬取

    import reold_url = '/?pageNum=2'total_page = 20f = 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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爬取上面的代码中的图片

    #-*-coding:utf8-*-import reimport 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 = 0for each in pic_url:print 'now downloading:' + eachpic = 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 requestsimport re# url = ''url = ';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

爬取翻页网站的详细课程信息和选课信息

    #-*_coding:utf8-*-import requestsimport reimport sysreload(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-8class 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 = '/?pageNum=1'jikespider = spider()all_links = jikespider.changepage(url,20)for link in all_links:print u'正在处理页面：' + linkhtml = jikespider.getsource(link)everyclass = jikespider.geteveryclass(html)for each in everyclass:info = jikespider.getinfo(each)classinfo.append(info)jikespider.saveinfo(classinfo)

爬虫正则表达式

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 refrom 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 = '''sdfxxhelloxxfsdfxxworldxxasdf'''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 = repile(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=".html">欢迎参加《Python定向爬虫入门课程》</a><div class="list"><ul><li><a href=".html">这是第一条</a></li><li><a href=".html">这是第二条</a></li><li><a href=".html">这是第三条</a></li></ul></div></div></body></html>

对上面的文本进行爬取

    import reold_url = '/?pageNum=2'total_page = 20f = 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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爬取上面的代码中的图片

    #-*-coding:utf8-*-import reimport 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 = 0for each in pic_url:print 'now downloading:' + eachpic = 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 requestsimport re# url = ''url = ';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

爬取翻页网站的详细课程信息和选课信息

    #-*_coding:utf8-*-import requestsimport reimport sysreload(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-8class 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 = '/?pageNum=1'jikespider = spider()all_links = jikespider.changepage(url,20)for link in all_links:print u'正在处理页面：' + linkhtml = 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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爬虫 正则表达式

爬虫 正则表达式

库文件 re

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方法

知识点讲解

测试用例

爬取简单文本

爬取图片

爬取网站课程信息 有bug

爬虫 正则表达式

库文件 re

符号

方法

知识点讲解

测试用例

爬取简单文本

爬取图片

爬取网站课程信息 有bug

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爬虫正则表达式

爬虫正则表达式

　爬取网站课程信息有bug

爬虫正则表达式

　爬取网站课程信息有bug

爬虫正则表达式

javascript - Type 'undefined' is not assignable to type 'menuItemProps[]' - Stack Overflow