Pillow verify() not finding corrupt jpgs

Question

I followed a tutorial that had the following Python code to find corrupt jpg files. I have a corrupt jpg on which I've tested this and the script doesn't find the file. Is there anything I'm missing? Running Python 3.9.

Edit: Sorry, I forgot to say. I did change the 'if endswith' to '.jpg' in my own script. This is just a copy pasta from the tutorial.

from os import listdir
from PIL import Image



for filename in listdir('./'):

  if filename.endswith('.png'):`
      try:
          img = Image.open('./'+filename) # open the image file
          img.verify() # verify that it is, in fact an image
      except (IOError, SyntaxError) as e:
          print('Bad file:', filename) # print out the names of corrupt files