当我在if语句中尝试使用列表索引时，为什么会失败？

Question

When I try to index in the statement, it says index out of range. I am trying to scrape stuff from the website.

import requests
from bs4 import BeautifulSoup

page = requests.get('https://www.set.or.th/set/factsheet.do?symbol=TRUE&ssoPageId=3&language=en&country=US')
soup = BeautifulSoup(page.text, 'html.parser')

list_stuff = list()
for x in soup.findAll('table',{'class':'factsheet'}):
   for tr in x.findAll('tr'):
      stuff=[td for td in tr.stripped_strings]
         if stuff[0] == 'Beta':
            list_stuff.append(stuff[1])

The code returns an error saying list index out of range and points to the stuff[0] line in the for loop

Answer 1

Add a step to check if the tuple is empty or not.

if not not stuff:                     #check if stuff is not empty
    if stuff[0] == 'Beta':
        list_stuff.append(stuff[1])