import?html_downloader
import?html_parser
import?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.HtmlOuputer()
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.parser(new_url,?html_cont)
self.urls.add_new_url(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'
obj_spider?=?SpiderMain()
obj_spider.craw(root_url)
import?urllib.requestclass?HtmlDownloader(object):
def?downloadn(self,?url):
if?url?is?None:
return?None
response?=?urllib.request.urlopen(url)
if?response.getcode()?!=?200:
return?None
return?response.read()
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?url?not?in?self.old_urls:
self.new_urls.add(url)
def?add_new_url(self,?url):
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?=?self.new_urls.pop()
self.old_urls.add(new_url)
return?new_url
from?bs4?import?BeautifulSoup
import?re
import?urllib.parse
class?HtmlParser(object):
def?_get_new_urls(self,?page_url,?soup):
new_url?=?ser()
links?=?soup.find_all('a',?href=re.compile(r'/item/'))
for?link?in?links:
new_url?=?link['href']
new_full_url?=?urllib.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?=?{}
#?url
res_data['url']?=?page_url
title_node?=?soup.find('dd',?class_='lemmaWgt-lemmaTitle-title').find('h1')
res_data['title']?=?title_node.get_text()
#?lemma-summary
summary_node?=?soup.find('div",?class_='lemma-summary')
res_data['summary']?=?summary_node.get_text()
retrun?res_data
def?parser(self,?page_url,?html_cont):
if?page_url?is?None?or?html_cont?is?None:
retrun
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)
retrun?new_urls,?new_data
class?HtmlOutputer(object):
def?__init__(self):
self.datas?=?[]
def?collect_data(self,?data):
if?data?is?None:
retrun
self.datas.append(data)
def?output_html(self):
fout?=?open('output.html',?'w',?encoding='utf-8')
fout.write('<html>')
fout.write('<head><meta?http-equiv=\'content-type\'?content=\'text/html;charset=utf-8\'></head>') 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['summary']) fout.write('</tr>') fout.write('</table>') fout.write('</body>') fout.write('</html>') fout.close()
為什么這段Python爬蟲代碼跑不通？
zhouss
2018-08-17 14:56:52
