Crawler instances--mainly using the RE and requests modules

Source: Internet
Author: User

Import osimport reimport requestsdef get_urls (Url, regex):     urls = []    base_url =  ' '      content = requests.get (URL). Content    area = (Regex,  content, re. S). Group (0)     tails = re.findall (R ' href= "(. *?)" ',  area)      for tail in tails:        urls.append (Base_url  + tail)     return urlsdef download_picture (url, count):     target_dir =  ' pic '     if os.path.exists (target_dir):         if not os.path.isdir (Target_dir):             os.remove (Target_dir)     else:   &nbSp;     os.mkdir (Target_dir)     content = requests.get ( URL). Content    picture_url = (R ' .*?</ul>      Regex2 = r ' <ul id= "showimg" .*?</ul> '     urls = get_urls ( URL,&NBSP;REGEX1)     for each_url in urls:         pictuRe_urls = get_urls (EACH_URL,&NBSP;REGEX2)         for  each_picture_url in picture_urls:             download_picture (Each_picture_url, count)              print  ' downloading picture  '  + str (count)              count += 1    return  Countdef get_next_page_url (URL):    base_url =  ' '     content = requests.get (URL) .content    tail = (R ' <a id= "Pagenext"  href= "(. *?)" ',  content). Group (1)     return  base_url + tailif __name__ ==  ' __main__ ':     url =   ' Http://'     count = 1    count = spider (url, count )     while true:        key = raw_ Input (' Input y/y to continue download next page, or input other  words to exit. ')         if re.match (R ' Y ',  key, re. I):             url = get_next_page_url ( URL)             count = spider (URL,  count)         else:             exit ()

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Crawler instances--mainly using the RE and requests modules

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