爬取全部的校園新聞

本次作業的要求來自於：

0.從新聞url獲取點選次數，並整理成函式

1.熟練運用re.search()，match()，findall()

2.從新聞url獲取新聞詳情： 字典,anews

import requests

from bs4 import beautifulsoup
from datetime import datetime
import re
def click(url):
id=re.findall('(\d+)',url)[-1]
clickurl=''.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
def alist(listurl):
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['newsurl'] = newsurl
newsdict['descricption'] = newsdesc
return newslist
listurl=''
alist(listurl)

4.生成所頁列表頁的url並獲取全部新聞 ：列表extend(列表) allnews

*每個同學爬學號尾數開始的10個列表頁

res=requests.get('')

res.encoding='utf-8'
soup=beautifulsoup(res.text,'html.parser')
soup.select('#pages')[0].text
int(re.search('..(\d+).下',soup.select('#pages')[0].text).groups(1)[0])
listurl=''
allnews=alist(listurl)
for i in range(5,15):
listurl='{}.html'.format(i)
allnews.extend(alist(listurl))

爬取多頁;

5.設定合理的爬取間隔

import time

import random

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

import time

import random
for i in range(1,3):
print(i)
time.sleep(random.random()*3)#休眠隨機數的3倍時間
print(tennews)

儲存到csv或excel檔案 

newsdf.to_csv(r'e:\gzcc.csv')

import pandas as pd

newsdf = pd.dataframe(allnews)
newsdf.to_csv(r'e:\gzcc.csv')

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