zoukankan      html  css  js  c++  java
  • 数据结构化与保存

    1. 将新闻的正文内容保存到文本文件

    f=open("content.text",‘a’,encoding='utf-8')
    f.write(content)
    f.close()

    2. 将新闻数据结构化为字典的列表:

    • 单条新闻的详情-->字典news
    • 一个列表页所有单条新闻汇总-->列表newsls.append(news)
    • 所有列表页的所有新闻汇总列表newstotal.extend(newsls)
    • def gzcc_content_info(content_url):
          content_info = {}
          resp = requests.get(content_url)
          resp.encoding = 'utf-8'
          soup = BeautifulSoup(resp.text, 'html.parser')
          match_str = {'author': '作者:(.*)s+[审核]?', 'examine': '审核:(.*)s+[来源]?', 'source': '来源:(.*)s+[摄影]?', 
                       'photography': '摄影:(.*)s+[点击]'}
          remarks = soup.select('.show-info')[0].text
          for i in match_str:
              if re.match('.*' + match_str[i], remarks):
                  content_info[i] = re.search(match_str[i], remarks).group(1).split("xa0")[0]
              else:
                  content_info[i] = "  "
          time = re.search('d{4}-d{2}-d{2}sd{2}:d{2}:d{2}', remarks).group()
          content_info['time'] = datetime.strptime(time, '%Y-%m-%d %H:%M:%S')
          content_info['title'] = soup.select('.show-title')[0].text
          content_info['url'] = content_url
          content_info['clicks'] = gzcc_content_clicks(content_url)
          return content_info
      
      def gzcc_list_page(page_url):
          page_news = []
          res = requests.get(page_url)
          res.encoding = 'utf-8'
          soup = BeautifulSoup(res.text, 'html.parser')
          news_list = soup.select('.news-list')[0]
          news_point = news_list.select('li')
          for i in news_point:
              a = i.select('a')[0]['href']
              page_news.append(gzcc_content_info(a))
          return page_news
      
      all_news = []
      url = 'http://news.gzcc.cn/html/xiaoyuanxinwen/'
      res = requests.get(url)
      res.encoding = 'utf-8'
      soup = BeautifulSoup(res.text, 'html.parser')
      n = int(soup.select('#pages')[0].select("a")[-2].text)
      all_news.extend(gzcc_list_page(url))
      for i in range(2, n):
          all_news.extend(gzcc_list_page('http://news.gzcc.cn/html/xiaoyuanxinwen/{}.html'.format(i)))


      3. 安装pandas,用pandas.DataFrame(newstotal),创建一个DataFrame对象df

    • df = pandas.DataFrame(all_news)

      4. 通过df将提取的数据保存到csv或excel 文件。  

    • df.to_excel('news.xlsx'

      5. 用pandas提供的函数和方法进行数据分析:

      • 提取包含点击次数、标题、来源的前6行数据
      • 提取‘学校综合办’发布的,‘点击次数’超过3000的新闻。
      • 提取'国际学院'和'学生工作处'发布的新闻。
      • df[['clicks', 'title', 'source']].head(6)
        
        df[(df['clicks'] > 3000) & (df['source'] == '学校综合办')]
        
        news_info = ['国际学院', '学生工作处']
        df[df['source'].isin(news_info)]
  • 相关阅读:
    概率-期望粗学
    2*2右脚相反矩阵构造 2019牛客暑期多校训练营(第八场)
    Codeforces Round #530 (Div. 2)F Cookies (树形dp+线段树)
    E. Arson In Berland Forest(思维,找二维阵列中的矩阵,二分)
    Codeforces Round #523 (Div. 2) Cdp
    凸包
    E
    G. Petya and Graph(经典项目与项目消耗问题)(网络流)
    Educational Codeforces Round 55 (Rated for Div. 2)E
    hdu 3501 Calculation 2 (欧拉函数的扩展)
  • 原文地址:https://www.cnblogs.com/168-hui/p/8810090.html
Copyright © 2011-2022 走看看