爬取全部的校园新闻

这次作业的要求来源https://edu.cnblogs.com/campus/gzcc/GZCC-16SE1/homework/3002

0.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

def click(url):
    id = re.findall('(d{1,5})', url)[-1]
    clickUrl = 'http://oa.gzcc.cn/api.php?op=count&id={}&modelid=80'.format(id)
    resClick = requests.get(clickUrl)
    newsClick = int(resClick.text.split('.html')[-1].lstrip("('").rstrip("');"))
    return newsClick


def newsdt(showinfo):
    newsDate = showinfo.split()[0].split(':')[1]
    newsTime = showinfo.split()[1]
    newsDT = newsDate + ' ' + newsTime
    dt = datetime.strptime(newsDT, '%Y-%m-%d %H:%M:%S')
    return dt


def anews(url):
    newsDetail = {}
    res = requests.get(url)
    res.encoding = 'utf-8'
    soup = BeautifulSoup(res.text, 'html.parser')
    newsDetail['nenewsTitle'] = soup.select('.show-title')[0].text
    showinfo = soup.select('.show-info')[0].text
    newsDetail['newsDT'] = newsdt(showinfo)
    newsDetail['newsClick'] = click(newsUrl)
    return newsDetail
newsUrl='http://news.gzcc.cn/html/2019/xiaoyuanxinwen_0410/11181.html'

def alist(url):
    res = requests.get(listUrl)
    res.encoding = 'utf-8'
    soup = BeautifulSoup(res.text, 'html.parser')
    newsList = []
    for news in soup.select('li'):
        if len(news.select('.news-list-title')) > 0:
            newsUrl = news.select('a')[0]['href']
            newsDesc = news.select('.news-list-description')[0].text
            newsDict = anews(newsUrl)
            newsDict['description'] = newsDesc
            newsList.append(newsDict)
    return newsList

　　

1.从新闻url获取新闻详情： 字典,anews

listUrl = 'http://news.gzcc.cn/html/xiaoyuanxinwen/'
alist(listUrl)
res = requests.get(listUrl)
res.encoding = 'utf-8'
soup = BeautifulSoup(res.text, 'html.parser')
for n in soup.select('li'):
    if n.select('.news-list-title'):
        print(n.select('a')[0]['href'])

i = int(soup.select('#pages')[0].text.split('..')[1].rstrip(' 下一页 '))
allnews = []
for i in range(99, 109):  # 爬取校园网有限范围的新闻内容
    listUrl = 'http://news.gzcc.cn/html/xiaoyuanxinwen/{}.html'.format(i)
    allnews.extend(alist(listUrl))
len(allnews)
print(allnews)

newsUrl = 'http://news.gzcc.cn/html/2005/xiaoyuanxinwen_0710/4.html'
anews(newsUrl)

　　

2.从列表页的url获取新闻url：列表append(字典) alist

res = requests.get('http://news.gzcc.cn/html/xiaoyuanxinwen/')
res.encoding = 'utf-8'
soup = BeautifulSoup(res.text, 'html.parser')
for news in soup.select('li'):
    if len(news.select('.news-list-title')) > 0:
        newsUrl = news.select('a')[0]['href']
        print(anews(newsUrl))

　　

3.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

s1 = pd.Series([100, 23, 'bugingcode'])
print(s1)
pd.Series(anews)

　　

4.设置合理的爬取间隔

import time

import random

time.sleep(random.random()*3)

newsdf = pd.DataFrame(allnews)
for i in range(2):
    print(i)
    time.sleep(random.random() * 3)  # 设置合理的爬取间隔
    print(newsdf)

　　

5.用pandas做简单的数据处理并保存

保存到csv或excel文件 

newsdf.to_excel(r'E:qiuhua.xlsx') 

保存到数据库

无