AttributeError: 'NoneType' object has no attribute 'children'

AttributeError: ‘NoneType’ object has no attribute ‘children’

第一次写爬虫，也是第一次博客，就碰到这个问题，查了半天也没找出原因，认真想了一下
‘NoneType’ 对象没有属性 ‘children’ ，应该是没有抓取到html网页內部信息，应该问题出现在def getHTMLText(url)函数没有得到url链接，贴出自己在慕课网看的嵩天老师的课程后写的代码

# -*- coding: utf-8 -*-
import requests
from bs4 import BeautifulSoup
import bs4

def getHTMLText(url):#01
    try:
        r = request.get(url, timeout=30)
        r.raise_for_status()
        r.encoding = r.apparent_encoding
        return r.text
    except:
        return ""
def fillUnivList(ulist,html):#02
    soup = BeautifulSoup(html,"html.parser")
    for tr in soup.find('tbody').children:
        if isinstance(tr,bs4.element.Tag):
            tds = tr('td')
            ulist.append([tds[0].string,tds[1].string,tds[2].string])
def printUnivList(ulist, num):
    tplt = "{0:^10}\t{1:{3}^10}\t{2:^10}"
    print(tplt.format("排名","学校名称","总分",chr(12288)))
    for i in range(num):
        u=ulist[i]
        print(tplt.format(u[0],u[1],u[2],chr(12288)))  

def main():
    
    uinfo = []
    url = 'http://www.zuihaodaxue.cn/zuihaodaxuepaiming2016.html'
    html = getHTMLText(url)
   
    fillUnivList(uinfo,html)
    printUnivList(uinfo,20)
main()

最后发现代码错误出现在

r = request.get(url, timeout=30)

request应该是requests
在网上查了下出现这个错误，基本都是代码关键字出错导致