python爬虫初学，运行不报错但是没有结果？

Question

import requests
from bs4 import BeautifulSoup
import bs4
def getHTMLText(url):
    try:
        r=request.get(url,timeout=30)
        r.raise_for_status()
        r.encoding=r.apparent_encoding
        return r.text
    except:
        return ""
    return ""
def fillUnivList(ulist,html):
    soup=BeautifulSoup(html,"html.parser")
    for tr in soup.find('tbody').children:
        if isinstance(tr,bs4.element.Tag):
            tds=th('td')
            ulist.append([tds[0].string,tds[1].string,tds[2].string])
    pass
def printUnivList(ulist,num):
    print("{:^10}\t{:^6}\t{:^10}".format("排名","学校名称","省市"))
    for i in range(num):
        u=ulist[i]
    print("{:^10}\t{:^6}\t{:^10}".format(u[0],u[1],u[2]))  
def main():
    uinfo=[]
    url="https://www.dxsbb.com/news/44368.html"
    html =getHTMLText(url)
    fillUnivList(uinfo,html)
    printUnivList(uinfo,30)
    main()

Answer 1

 

代码问题：1.request少写了s。

2. fillUnivList(ulist,html)函数没有return。

3.printUnivList(ulist,num)缺少异常处理。

4.main()没有调用，应该放到main()函数外。

改成这样就行了。

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 ""
    return ""
def fillUnivList(ulist,html):
    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])
    return ulist
def printUnivList(ulist,num):
    print("{:^10}\t{:^6}\t{:^10}".format("排名","学校名称","省市"))
    for i in range(num):
        try:
            u=ulist[i]
            print("{:^10}\t{:^6}\t{:^10}".format(u[0],u[1],u[2]))
        except:
            pass  
def main():
    uinfo=[]
    url="https://www.dxsbb.com/news/44368.html"
    html =getHTMLText(url)
    ulist=fillUnivList(uinfo,html)
    printUnivList(ulist,30)
if __name__=='__main__':
    main()