運(yùn)行沒(méi)有報(bào)錯(cuò)，但結(jié)果為空：
C:\Users\CCF\PycharmProjects\untitled\venv\Scripts\python.exe?C:/Users/CCF/PycharmProjects/untitled/baike_spider/spider_main.py
Process?finished?with?exit?code?0
SpiderMain
#?-*-?coding:?utf-8?-*-
from?baike_spider?import?url_manager
from?baike_spider?import?html_downloader
from?baike_spider?import?html_parser
from?baike_spider?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.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"
???obj_spider?=?SpiderMain()
???obj_spider.craw(root_url)
url_manager
#?-*-?coding:?utf-8?-*-
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_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?=?self.new_urls.pop()
??????self.old_urls.add(new_url)
??????return?new_url
html_downloader
#?-*-?coding:?utf-8?-*-
from?urllib?import?request
class?HtmlDownloader(object):
???@staticmethod
???def?download(url):
??????if?url?is?None:
?????????return??None
??????response?=?request.urlopen(url)
??????if?response.getcode()?!=?200:
?????????return?None
??????return?response.read()
html_parser
#?-*-?coding:?utf-8?-*-
import?re
from?bs4?import?BeautifulSoup
from?urllib?import?parse
class?HtmlParser(object):
???@staticmethod
???def?_get_new_urls(page_url,?soup):
??????new_urls?=?set()
??????#https://baike.baidu.com/item/Python/407313
??????#?/item/Google/86964
??????links?=?soup.find_all('a',?href=re.compile(r"/item/"))
??????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?parse(self,?page_url,?html_cont):
??????#?noinspection?PyUnreachableCode
??????if?page_url?is?None?or?html_cont?is?None:
?????????return
?????????#?noinspection?PyUnreachableCode
?????????soup?=?BeautifulSoup(html_cont,?'html.parser',?from_encoding='utf-8')
?????????new_urls?=?self._get_new_urls(page_url,?soup)
?????????new_data?=?_get_new_data(page_url,?soup)
?????????return??new_urls,?new_data
def?_get_new_data(?page_url,?soup):
???res_data?=?{'url':?page_url}
???#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
html_outputer
#!/usr/bin/env?python3
#?-*-?coding:?utf-8?-*-
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?-->?utf-8
??????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("</tr>")
??????fout.write("</html>")
??????fout.write("</body>")
??????fout.write("</table>")
??????fout.close()
2019-07-26