동영상과 동일하게 작성하였는데

print(a)는 잘나오는데 print(a['alt'])는 안나오는 이유가 뭘까요?

작성한 코드 및 에러 메세지

import requests
from bs4 import BeautifulSoup

headers = {'User-Agent' : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36'}
data = requests.get('https://movie.naver.com/movie/sdb/rank/rmovie.naver?sel=pnt&date=20210829',headers=headers)

soup = BeautifulSoup(data.text, 'html.parser')

# 코딩 시작
#old_content > table > tbody > tr:nth-child(2) > td:nth-child(1) > img
#old_content > table > tbody > tr:nth-child(3) > td:nth-child(1) > img
moveis = soup.select('#old_content > table > tbody > tr')
for move in moveis:
   a=move.select_one('td:nth-child(1) > img')
   print(a['alt'])

Traceback (most recent call last):

 File "C:\Users\asdas\OneDrive\바탕 화면\spart\pythonprac\hello.py", line 15, in <module>

  print(a['alt'])

TypeError: 'NoneType' object is not subscriptable