程序跑不起来啊,那个大佬帮我看看错在哪里哦!(查过Google和百度了)

import requests
from bs4 import BeautifulSoup
import bs4


def get_html_text(url):  # 获取页面信息
    try:
        r = requests.get(url, timeou=3)
        r.raise_for_status()
        r.encoding = 'utf-8'
        return r.text
    except:
        return ""


def fill_univlist(ulist, html):
    soup = BeautifulSoup(html, 'html.parser')
    for tr in soup.find('tbody').children:
        if isinstance(tr, bs4.element.Tag):  # 去除所有非标签类的信息
            tds = tr('td')  # 查询tr标签中的td标签
            ulist.append(tds[0].string, tds[1].string, tds[2].string, )


def print_univlist(ulist, num):
    print("{:^10}\t{:^6}\t{:^10}\t".format("排名", "学校名称", "总分"))

    for i in range(num):
        u = ulist[i]
        print("{:^10}\t{:^6}\t{:^10}\t".format(u[0], u[1], u[2]))


def main():
    url = 'http://www.'
    uinfo = []
    html = get_html_text(url)
    fill_univlist(uinfo, html)
    print_univlist(uinfo, 20)


main()