爬取全部的校园新闻
作业来源于:https://edu.cnblogs.com/campus/gzcc/GZCC-16SE1/homework/3002
1.从新闻url获取点击次数,并整理成函数
- newsUrl
- newsId(re.search())
- clickUrl(str.format())
- requests.get(clickUrl)
- re.search()/.split()
- str.lstrip(),str.rstrip()
- int
- 整理成函数
- 获取新闻发布时间及类型转换也整理成函数
2.从新闻url获取新闻详情: 字典,anews
3.从列表页的url获取新闻url:列表append(字典) alist
4.生成所页列表页的url并获取全部新闻 :列表extend(列表) allnews
*每个同学爬学号尾数开始的10个列表页
5.设置合理的爬取间隔
import time
import random
time.sleep(random.random()*3)
6.用pandas做简单的数据处理并保存
保存到csv或excel文件
newsdf.to_csv(r'F:\duym\爬虫\gzccnews.csv')
完整代码:
import requests from bs4 import BeautifulSoup from datetime import datetime import re import pandas as pd import time import random # 获取点击次数 def clickCount(url): newsId = re.search('/(\d+).html', url).groups(0)[0] timeUrl='http://oa.gzcc.cn/api.php?op=count&id={}&modelid=80'.format(newsId) clickTime=re.findall("\d+",requests.get(timeUrl).text.split(';')[3])[0] return clickTime #获取新闻时间 def newsDateTime(head): date=head[0][5:] time=head[1] format='%Y-%m-%d %H:%M:%S' return datetime.strptime(date+" "+time,format) #获取新闻信息 def anews(url): newsDetail={} get=requests.get(url) get.encoding='utf-8' soup=BeautifulSoup(get.text,'html.parser') newsDetail['title']=soup.select('.show-title')[0].text; # 新闻题目 head=soup.select('.show-info')[0].text.split() newsDetail['datetime']=newsDateTime(head) # 新闻时间 newsDetail['clickTime']=clickCount(url) # 点击次数 newsDetail['content'] = soup.select('.show-content')[0].text # 点击内容 newsDetail['url']=url return newsDetail #获取新闻列表页中的新闻url def alist(listUrl): get=requests.get(listUrl) get.encoding='utf-8' soup=BeautifulSoup(get.text,'html.parser') newsList=[] for news in soup.select('li'): if len(news.select('.news-list-title'))>0: newsUrl=news.select('a')[0]['href'] newsList.append(newsUrl) return newsList #爬取64至74页的数据 url=[] for i in range(64,74): url.extend(alist('http://news.gzcc.cn/html/xiaoyuanxinwen/{}.html'.format(i))) allnews=[]; for i in url: allnews.append(anews(i)) #保存文件 pd.Series(allnews) newsdf=pd.DataFrame(allnews) newsdf.to_csv('news.csv',encoding='utf-8') #设置合理的爬取间隔 for i in range(5): time.sleep(random.random()*3) print(newsdf)
效果展示:
posted on 2019-04-15 15:14 hyf751190951 阅读(138) 评论(0) 编辑 收藏 举报