用anaconda python 3 写的。按照老师爬虫写的，为什么能运行没有结果？谁能帮我分析下什么原因吗？
class spidermain(object):
def __init__(self):
self.urls=manager()
self.downloader=htmldownloader()
self.parser=htmlparser()
self.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()
html_cont=self.downloader.htmldownloader(new_url)
print ('carw %d : %s'%(count,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='http://baike.baidu.com/link?url=HiLgunmevYfwmNeyDfoDsrKn4d2OSBg-wcbpXCMCLKo53TPcrL8mGOW-xBdn5Q_gOaMVAQFmXIqkpKNAjQyR2a'
obj_spider=spidermain()
obj_spider.craw(root_url)
#html管理器 html_manager模块
class manager(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_urls(self,urls):
if urls is None or len(urls)==0:
return
if 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
#html下载器 htmldownloader模块
import urllib.request
import urllib.error
class htmldownloader(object):
def download(self,url):
if url is None:
return None
response=urllib.request.ulropen(url)
if response.getcode()!=200:
return None
return response.read()
#html解析器 htmlparser模块
from bs4 import BeautifulSoup
import re
import urllib.parse
class htmlparser(object):
def _get_new_urls(self,page_url,soup):
new_urls=set()
#<a target="_blank" href="/view/592974.htm">解释器</a>
links=soup.find_all('a',href=re.complie(r'/view/\d+\.htm'))
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
#<dd class="lemmaWgt-lemmaTitle-title"><h1>Python</h1>
title_node=soup.find('dd',class_='lemmaWgt-lemmaTitle-title').find('h1')
res_data['title']=title_node.get_text()
#<div class="lemma-summary" label-module="lemmaSummary"></div>
summary_node=soup.find('div',class_='lemma-summary')
res_data['summary']=summary_node.get_text()
return res_data
def parse(self,page_url,html_count):
if page_url is None or html_count is None:
return
soup=BeautifulSoup(html_count,'html.parser',form_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_data
#html输出器 htmloutputer模块
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>')
#ascii
for data in self.datas:
fout.write('<tr>')
fout.write('<td>%s</td>'%data['url'])
fout.write('<td>%s</td>'%data['title'],edcoding='utf-8')
fout.write('<td>%s</td>'%data['summary'],edcoding='utf-8')
fout.write('<tr>')
fout.write('</table>')
fout.write('</body>')
fout.write('</html>')
fout.close()
三不青年1回答
-
tanhouyusheng
那个是直接写到一个文件里的，你的没有多出来一个文件吗。
随时随地看视频慕课网APP
相关分类
Python