import?url_manager,html_downloader,html_parser,\
?????html_outputer

class?SpiderMain(object):
????def?_inti_(self):
????????self.urls?=?url_manager.UrlManager()
????????self.downloader?=?html_downloader.HtmlDdownloader()
????????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.url.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?=?"http://baike.baidu.com/view/21087.htm"
????obj_spider?=?SpiderMain()
????obj_spider.craw(root_url)

顯示_name_未定義，請問應(yīng)該如何解決？

IDLE, python 2.7.6