1)③爬取网易It方面部分新闻

 __author__ = 'minmin'
 #coding:utf-8
 import re,urllib,sgmllib,os

 #根据当前的url获取html
 def getHtml(url):
     page = urllib.urlopen(url)
     html = page.read()
     page.close()
     return html

 #根据html获取想要的文章内容
 def func(str):
      result= re.findall(r"<p>([^<>]*)</p>",getHtml(url),re.M)
      artical =''
      for j in result:
          if len(j)<>0:
              j = j.replace("&nbsp;","")
              j = j.replace("<STRONG>","   ")#去掉<STRONG>,换成"     "
              j = j.replace("</STRONG>","   ")#去掉</STROGN>换成"     "
              temp = re.findall(r"Copyright.*?",j,re.M);
              if temp == []:
                  artical = artical + j + '\n'
      return  artical

 #html链接的标签是“a”，链接的属性是“href”，也就是要获得html中所有tag=a，attrs=href 值。
 class URLPaser(sgmllib.SGMLParser):
     def reset(self):
         sgmllib.SGMLParser.reset(self)
         self.urls = []

     def start_a(self,attrs):
         href = [v for k,v in attrs if k == 'href']
         if href:
             self.urls.extend(href)

 IParser = URLPaser()
 socket = urllib.urlopen("http://tech.sina.com.cn/it/")#打开这个网页

 #fout = file('qq_art_urls.txt','w')#要把这个链接写到这个文件中
 IParser.feed(socket.read())#分析啦

 reg = 'http://tech.sina.com.cn/it/.*'#这个是用来匹配符合条件的链接，使用正则表达式匹配

 pattern = re.compile(reg)
 os.getcwd()#获得当前文件夹路径
 os.path.sep#当前系统路径分隔符

 #判断文件是否存在
 if os.path.exists('news163_it')==False:
      os.makedirs('news163_it')

 i = 0
 url2 = []
 for url in IParser.urls:#链接都存在urls里
     if pattern.match(url):
         if url not in url2:
             url2.append(url)
             artical = func(url)
             if len(artical)<>0:
                  print url
                  print artical
                  i = i + 1
                  f = open("news163_it/"+ str(i) + '.txt','a+')
                  f.write(artical)
                  f.close()