中国大学排名定向爬虫

# coding=utf-8
import requests
from bs4 import BeautifulSoup
import bs4

class Ranking:
    def getHtml(self,url):
        try:
            r = requests.get(url,timeout=30)
            r.raise_for_status()
            r.encoding = r.apparent_encoding
            return r.text
        except:
            return ""
    def urlList(self,numberList,schoolList,scoreList, html):
        try:
            soup = BeautifulSoup(html, "html.parser")
            ##匹配带有class属性的tbody标签
            tbodyInfo = soup.find("tbody", attrs={'class': 'hidden_zhpm'})
            if isinstance(tbodyInfo,bs4.element.Tag):
                #找到tbody下的tr标签
                trList = tbodyInfo.find_all('tr')
                for tdTag in trList:
                    #在每个tr标签下,查找所有的td标签
                    tdList = tdTag.find_all('td')
                    #通过角标获取所要的值
                    numberList.append(tdList[0].string)
                    schoolList.append(tdList[1].string)
                    scoreList.append(tdList[3].string)
            return numberList,schoolList,scoreList
        except Exception as e:
            print(e)
    def printList(self, num):
        try:
            with open("data2.txt",'w',encoding='utf-8') as f:
                for i in range(num):
                    f.write("{0:^10}\t{1:{3}^10}\t{2:^10}".format(numberList[i], schoolList[i], scoreList[i],chr(12288)))
                    f.write('\n')
        except IOError as e:
            print(e)
if __name__ == '__main__':
    numberList = []
    schoolList = []
    scoreList = []
    url = "http://www.zuihaodaxue.com/zuihaodaxuepaiming2019.html"
    rank = Ranking()
    html = rank.getHtml(url)
    rank.urlList(numberList,schoolList,scoreList,html)
    rank.printList(len(numberList))