爬取定向网页大学排名

# coding=utf-8
import requests
from bs4 import BeautifulSoup
import bs4
def getHTML(url):
    try:
        r=requests.get(url,timeout=30)   #获取请求
        r.raise_for_status                 #请求状态
        r.encoding=r.apparent_encoding   #编码
        return r.text
    except:
        return ""
def getUnlist(unifo,html):
    soup=BeautifulSoup(html,"html.parser")   
    for tr in soup.find(‘tbody‘).find_all(‘tr‘):  #找到tbody内的所有tr
        tds=tr.find_all(‘td‘)
        unifo.append([tds[0].string,tds[1].string,tds[3].string])
        
def printUnlist(unifo,num):
    tplt="{0:^10}\t{1:{3}^15}\t{2:^10}"
    print(tplt.format("排名","大学名称","分数",chr(12288))) #用中文字符补全
    for i in range(num):
        t=unifo[i]
        print(tplt.format(t[0],t[1],t[2],chr(12288)))
def main():
    url="http://www.zuihaodaxue.cn/zuihaodaxuepaiming2016.html"
    html=getHTML(url)
    unifo=[]
    getUnlist(unifo,html)
    printUnlist(unifo,20)
main()