代码和老师的一样 出现这个报错

Traceback (most recent call last):
  File "/home/桌面/python/baike_spider/spider_main.py", line 35, in <module>
    obj_spider = SpiderMain()
  File "/home/桌面/python/baike_spider/spider_main.py", line 10, in __init__
    self.parser = html_parser.HtmlParser()
AttributeError: 'module' object has no attribute 'HtmlParser'

附上主程序代码

import html_downloader, html_outputer, html_parser, url_manager



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, rot_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.downloader(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)