按照课程写的爬虫程序但是输出没有任何结果？

主程序：

from baidubaike import url_manger, html_download, html_parser, html_outputer

class SpiderMain(object):

def __init__(self):

self.urls = url_manger.UrlManager()

self.downloader = html_download.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 +=1

except:

print('craw failed')

self.outputer.output_html()

if __name__ =="main":

root_url = "http://baike.baidu.com/view/21087.htm"

obj_spider = SpiderMain()

obj_spider.craw(root_url)

parser程序：

from bs4 import BeautifulSoup

import re

from urllib.parse import urljoin

class HtmlParser(object):

def _get_new_urls(self, page_url, soup):

res_data = {}

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">

summary_node = soup.find('div',class_="lemma-summary")

res_data['summary'] = summary_node.get_text()

return res_data

def _get_new_data(self, page_url, soup):

new_urls = set()

links = soup.find_all('a',re.compile(r'/view/\d+\.htm'))

for link in links:

new_url = link['href']

new_full_url = urljoin(page_url,new_url)

new_urls.add(new_full_url)

return new_urls

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_data

outputer程序：

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'].encode('utf-8'))

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>')

小宝君等期待

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按照课程写的爬虫程序但是输出没有任何结果？

3回答