output_html和控制臺(tái)都為空，誰(shuí)能幫我看看代碼哪里錯(cuò)了
spider_main.py
????
from?baike_spider?import?url_manager,?html_downloader,?html_parser,?html_outputer
class?SpiderMain(object):
????def?__init__(self):
????????self.urls?=?url_manager.UrlManager()
????????self.downloader?=?html_downloader.HtmlDownloader()
????????self.parser?=?html_parser.HtmlParser()
????????self.outputer?=?html_outputer.HtmlOutputer()
????def?craw(self,?root_url):
????????count?=?1
????????self.urls.add_new_url(root_url)
????????while?self.urls.has_new_url():
????????????try:
????????????????new_url?=?self.urls.get_new_url()
????????????????print('craw?%d?:?%s')%(count,new_url)
????????????????html_cont?=?self.downloader.download(new_url)
????????????????new_urls,new_data?=?self.parser.parse(new_url,html_cont)
????????????????self.urls.add_new_urls(new_urls)
????????????????self.outputer.collect_data(new_data)
????????????????if?count?==?1000:
????????????????????break
????????????????count?=?count?+?1
????????????except:
????????????????print('craw?failed')
????????self.outputer.output_html()
if?__name__=="__main__":
????root_url="https://baike.baidu.com/item/Python/407313?fr=aladdin"
????obj_spider?=?SpiderMain()
????obj_spider.craw(root_url)url_manager.py
????
class?UrlManager(object): ????def?__init__(self): ????????self.new_urls?=?set() ????????self.old_urls?=?set() ????def?add_new_url(self,url): ????????if?url?is?None: ????????????return ????????if?url?not?in?self.new_urls?and?self.old_urls: ????????????self.new_urls.add(url) ????def?add_new_urls(self,urls): ????????if?urls?is?None?or?len(urls)?==?0: ????????????return ????????for?url?in?urls: ????????????self.add_new_url(url) ????def?has_new_url(self): ????????return?len(self.new_urls)?!=?0 ????def?get_new_url(self,new_url): ????????new_url?=?self.new_urls.pop() ????????self.old_urls.add(new_url) ????????return?new_url
html_parser.py
import?re
from?urllib?import??parse
from?bs4?import?BeautifulSoup
class?HtmlParser(object):
????def?_get_new_urls(self,page_url,soup):
????????new_urls?=?set()
????????links?=?soup.find_all('a',href=re.compile(r"/item/Python/\d+\?."))
????????for?link?in?links:
????????????new_url?=?link['href']
????????????new_full_url?=?parse.urljoin(page_url,new_url)
????????????new_urls.add(new_full_url)
????????return?new_urls
????def?_get_new_data(self,page_url,soup):
????????res_data?=?{}
????????res_data['url']?=?page_url
????????title_node?=?soup.find('dd',class_="lemmaWgt-lemmaTitle-title").find("h1")
????????res_data['title']?=?title_node.get_text()
????????summary_node?=?soup.find('div',class_="lemma-summary")
????????res_data['summary']?=?summary_node.get_text()
????????return?res_data
????def?parse(self,page_url,html_cont):
????????if?page_url?is?None?or?html_cont?is?None:
????????????return
????????????soup?=?BeautifulSoup(html_cont,'html.parser',from_encoding='utf-8')
????????????new_urls?=?self._get_new_urls(page_url,soup)
????????????new_data?=?self._get_new_data(page_url,soup)
????????return?new_urls,new_datahtml_outputer.py
class?HtmlOutputer(object):
????def?__init__(self):
????????self.datas?=?[]
????def?collect_data(self,?data):
????????if?data?is?None:
????????????return
????????self.datas.append(data)
????def?output_html(self):
????????fout?=?open('output_html','w')
????????fout.write("<html>")
????????fout.write("<body>")
????????fout.write("<table>")
????????for?data?in?self.datas:
????????????fout.write("<tr>")
????????????fout.write("<td>%s</td>"%data['url'])
????????????fout.write("<td>%s</td>"?%?data['title'].encode('utf-8'))
????????????fout.write("<td>%s</td>"?%?data['summary'].encode('utf-8'))
????????fout.write('</table')
????????fout.write('</body>')
????????fout.write('</html>')
????????fout.close()html_downloader.py
import?urllib import?urllib.request class?HtmlDownloader(object): ????def?download(self,url): ????????if?url?is?None: ????????????return?None ????????response?=?urllib.request.urlopen(url) ????????if?response.getcode()?!=?200: ????????????return?None ????????return?response.read()
2018-12-14
需要將解析器里改成這樣
links?=?soup.find_all('a',href=re.compile(r"/item/"))2018-08-19
百度百科的url鏈接規(guī)則已經(jīng)更改了，需要重新分析，并修改代碼