Python PIL读取的图像发生自动旋转的实现方法

from PIL import Image, ExifTags
img = Image.open(file)
try:
  for orientation in ExifTags.TAGS.keys() : 
    if ExifTags.TAGS[orientation]=='Orientation' : break 
  exif=dict(img._getexif().items())
  if  exif[orientation] == 3 : 
    img=img.rotate(180, expand = True)
  elif exif[orientation] == 6 : 
    img=img.rotate(270, expand = True)
  elif exif[orientation] == 8 : 
    img=img.rotate(90, expand = True)
except:
  pass