自己爬虫的几个案例

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爬取中国大学排名

#这个只用到了requests 和 bs4
#爬取大学排名
import requests
from bs4 import BeautifulSoup as bs
def grthtml(url):
    demo=requests.get(url)
    demo.encoding=demo.apparent_encoding
    demo=demo.text
    return(demo)
def listhtml(ulist,html):
    soup=bs(html,"html.parser")
    soup=soup.tbody
    for tr in soup("tr"):
        tds=tr("td")
        ulist.append([tds[0].string,tds[1].string,tds[2].string])
def pmhtml(ulist,num):
    print('{0:^10}\t{1:{3}^7}\t{2:^10}'.format("排名","校名","地址",chr(12288)))
    for i in ulist[0:num]:
        print("{0:^10}\t{1:{3}^10}\t{2:^10}".format(i[0],i[1],i[2],chr(12288)))
if __name__=="__main__":
    url="http://www.zuihaodaxue.cn/zuihaodaxuepaiming2016.html"
    html=grthtml(url)
    uinfo=[]
    listhtml(uinfo,html)
    num=int(input())
    pmhtml(uinfo,num)

爬取今日头条热点

# 这个爬取的是动态页面
# 爬取动态页面，今日头条
# 源文件里是没有内容的只有js
import requests
from bs4 import BeautifulSoup as bs
import json
def gethtml(url):
    try:
    	#通过F12检查出来自下面这个链接
        # url="https://www.toutiao.com/api/pc/feed/?category=news_hot&utm_source=toutiao&widen=1&max_behot_time=0&max_behot_time_tmp=0&tadrequire=true&as=A1D5FDAAB5194AE&cp=5DA599948ACE7E1&_signature=TBeQ-wAAEbOkzbKGAd3hQUwXkO"
        head={'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36','Cookie':#cookie就用自己的吧}
        r=requests.get(url,headers=head)
        return r.text #返回json文件
    except:
        print("oneerror")
def getulist(html,list):
    try:
        soup=json.loads(html)
        soupdata=soup['data']
        for one in soupdata:
            a='https://www.toutiao.com/a'+one['group_id']
            list.append([one['title'],one['abstract'],a])
    except:
        print("twoerror")
def printulist(list):
    for i in list:
        print("title:\n{}".format(i[0]))
        print("简介：\n{}".format(i[1]))
        print("链接:{:^30}".format(i[2]))
if __name__=="__main__":
    url = "https://www.toutiao.com/api/pc/feed/?category=news_hot&utm_source=toutiao&widen=1&max_behot_time=0&max_behot_time_tmp=0&tadrequire=true&as=A1D5FDAAB5194AE&cp=5DA599948ACE7E1&_signature=TBeQ-wAAEbOkzbKGAd3hQUwXkO"
    html=gethtml(url)
    relist=[]
    getulist(html,relist)
    printulist(relist)

爬取知乎热点

#爬取知乎
import requests
from bs4 import BeautifulSoup as bs
def gethtml(url):
    headers={'user-agent':'Mozila/5.0','Cookie':#cookie就用自己的吧}
    r=requests.get(url,headers=headers)
    r.raise_for_status()
    r.encoding=r.apparent_encoding
    r=r.text
    return r
def getlist(ulist,html):
    soup=bs(html,"html.parser")
    soup = soup("div", "HotList-list")
    c=soup[0].contents
    for sect in c:
        if sect.a.p:
            pp=sect.a.p.string
        else:
            pp="该题目下没有相应简介"
        ulist.append([sect.a.h2.string,pp,sect.a.attrs['href']])
def printlist(ulist,num):
    top=1
    for i in ulist[0:num]:
        print("top{}".format(top))
        top+=1
        print("题目：{}".format(i[0]))
        print("优秀回答简介：\n{}".format(i[1]))
        print("链接\n{}".format(i[2]))
        # print("\n")
if __name__ == "__main__":
    url="https://www.zhihu.com/hot"
    ulist=[]
    print("您想看知乎热榜top几？")
    num=int(input())
    html=gethtml(url)
    getlist(ulist,html)
    printlist(ulist,num)