爬虫爬取大学排名示例
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2024-03-14 14:42:10
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# -*- coding: utf-8 -*-
"""
Created on Wed Nov 7 19:33:21 2018
#步骤1:从网络上获取大学排名网页内容
getHTMLText
#步骤2: 提取网页内容中信息到合适的数据结构
fillUnivList()
#步骤3:利用数据结构展示并输出结果
printUnivList()
"""
import requests
from bs4 import BeautifulSoup
import bs4
def getHTMLText(url):
try:
r = requests.get(url, timeout = 30)
r.raise_for_status()
r.encoding = r.apparent_encoding()
return r.text
except:
return ""
def fillUnivList(ulist, html):
soup = BeautifulSoup(html, 'html.parser')
for tr in soup.find('tbody').children:
if isinstance(tr, bs4.element.Tag): #过滤掉非element.Tag类型的数据
tds = tr('td') #存td标签
ulist.append([tds[0].string, tds[1].string, tds[2].string])
def printUnivList(ulist, num):
"^居中对齐,^10为宽度设定,中文字符不够时,默认用英文字符填充,中文空格char(12288)"
print("{:^10}\t{:^6}\t{:^10}".format("排名","学校名","得分"))
tplt = "{0:^10}\t{1:{3}^10}\t{2:^10}"
print(tplt.format("排名","学校名","得分",chr(12288)))
# print("{:^10}\t{:^6}\t{:^10}".format("排名","学校名","得分"))
for i in range(num):
u=ulist[i]
print(tplt.format(u[0],u[1],u[2],chr(12288)))
print("Suc" + str(num))
def main():
uinfo = []
url = 'http://www.zuihaodaxue.cn/zuihaodaxuepaiming2016.html'
html = getHTMLText(url)
fillUnivList(uinfo, html)
printUnivList(uinfo, 20)
if '__name__'=='__main__':
main()
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