Python通过解析网页实现看报程序的方法

本文所述实例可以实现基于Python的查看图片报纸《参考消息》并将当天的图片报纸自动下载到本地供查看的功能，具体实现代码如下：

# coding=gbkimport urllib2import socketimport reimport timeimport os# timeout in seconds#timeout = 10#socket.setdefaulttimeout(timeout)timeout = 10urllib2.socket.setdefaulttimeout(timeout)home_url = "http://www.hqck.net"home_page = ""try:  home_page_context = urllib2.urlopen(home_url)  home_page = home_page_context.read()  print "Read home page finishd."  print "-------------------------------------------------"except urllib2.URLError,e:  print e.code  exit()except:  print e.code  exit()reg_str = r'<a class="item-baozhi" href="/arc/jwbt/ckxx//d{4}//d{4}//w+/.html" rel="external nofollow" ><span class.+>.+</span></a>'news_url_reg = re.compile(reg_str)today_cankao_news = news_url_reg.findall(home_page)if len(today_cankao_news) == 0:  print "Cannot find today's news!"  exit()my_news = today_cankao_news[0]print "Latest news link = " + my_newsprinturl_s = my_news.find("/arc/")url_e = my_news.find(".html")url_e = url_e + 5print "Link index = [" + str(url_s) + "," + str(url_e) + "]"my_news = my_news[url_s:url_e]print "part url = " + my_newsfull_news_url = home_url + my_newsprint "full url = " + full_news_urlprintimage_folder = "E://new_folder//"if (os.path.exists(image_folder) == False):  os.makedirs(image_folder)today_num = time.strftime('%Y-%m-%d',time.localtime(time.time()))image_folder = image_folder + today_num + "//"if (os.path.exists(image_folder) == False):  os.makedirs(image_folder)print "News image folder = " + image_folderprintcontext_uri = full_news_url[0:-5]first_page_url = context_uri + ".html"try:  first_page_context = urllib2.urlopen(first_page_url)  first_page = first_page_context.read()except urllib2.HTTPError, e:  print e.code  exit()tot_page_index = first_page.find("共")tot_page_index = tot_page_indextmp_str = first_page[tot_page_index:tot_page_index+10]end_s = tmp_str.find("页")page_num = tmp_str[2:end_s]print page_numpage_count = int(page_num)print "Total " + page_num + " pages:"printpage_index = 1download_suc = Truewhile page_index <= page_count:  page_url = context_uri  if page_index > 1:    page_url = page_url + "_" + str(page_index)  page_url = page_url + ".html"  print "News page link = " + page_url  try:    news_img_page_context = urllib2.urlopen(page_url)  except urllib2.URLError,e:    print e.reason    download_suc = False    break    news_img_page = news_img_page_context.read()  #f = open("e://page.html", "w")  #f.write(news_img_page)  #f.close()  reg_str = r'http://image/S+jpg'  image_reg = re.compile(reg_str)  image_results = image_reg.findall(news_img_page)  if len(image_results) == 0:    print "Cannot find news page" + str(page_index) + "!"    download_suc = False    break    image_url = image_results[0]  print "News image url = " + image_url  news_image_context = urllib2.urlopen(image_url)  image_name = image_folder + "page_" + str(page_index) + ".jpg"  imgf = open(image_name, 'wb')  print "Getting image..."  try:    while True:      date = news_image_context.read(1024*10)      if not date:        break      imgf.write(date)    imgf.close()  except:    download_suc = False    print "Save image " + str(page_index) + " failed!"    print "Unexpected error: " + sys.exc_info()[0] + sys.exc_info()[1]  else:    print "Save image " + str(page_index) + " succeed!"    print  page_index = page_index + 1if download_suc == True:  print "News download succeed! Path = /"" + str(image_folder) + "/""  print "Enjoy it! ^^"else:  print "news download failed!"