XPComment and XPKeywords does not appear when writing exif metadata.
from PIL import Image
filepath = "yourFilepath.jpg"
image = Image.open(filepath)
XPComment = 0x9C9C
XPKeywords = 0x9C9E
exifdata = image.getexif()
exifdata[XPComment] = "new comment"
exifdata[XPKeywords] = "new keyword;"
image.save(filepath, exif=exifdata)
# ???? where's my exif data yo?