#-*-coding:utf-8-*- 
''''' 
Created on 2017年3月17日 
@author: lavi 
''' 
import requests 
from bs4 import BeautifulSoup 
import bs4 
def getHTMLText(url): 
  try: 
    r = requests.get(url) 
    r.raise_for_status 
    r.encoding = r.apparent_encoding 
    return r.text 
  except: 
    return "" 
 
def fillUnivList(univList,html): 
  soup = BeautifulSoup(html,"html.parser") 
  for tr in soup.find("tbody").children: 
    if isinstance(tr,bs4.element.Tag): #tobody有的节点是空串，属于要判断类型进行过滤 
      tds = tr("td") #等价于tr.find_all("td") 
      univList.append([tds[0].string,tds[1].string,tds[2].string]) #NavigableString可以跨越多个层次 
 
def printUnivList(univList,num): 
  tplt = "{0:^6}\t{1:^10}\t{2:^6}" #:前的数字说明使用format函数的第几个参数填充模板 
  print(tplt.format("排名","学校名称","总分",chr(12288))) 
  for i in range(num): 
    u = univList[i] 
    print(tplt.format(u[0],u[1],u[2],chr(12288))) 
def main(): 
  url= "http://www.zuihaodaxue.cn/zuihaodaxuepaiming2016.html"; 
  html = getHTMLText(url) 
  univList=[] 
  fillUnivList(univList,html) 
  printUnivList(univList,20) 
   
main()