Python如何读取文件中图片格式

import os
dirfff1 = "C:\\Users\\Administrator\\Desktop\\image_format"
dirfff='C:\\Users\\Administrator\\Desktop\\a'
from PIL import Image
all_files = os.listdir(dirfff)
for i in all_files:
  # 给当前文件加上绝对路径
  thisff = os.path.join(dirfff, i)
  print(thisff)
  Image.open(thisff,"r")
  im = Image.open(thisff,"r")
  print(im.size,im.format,im.mode)