code: def post_process(self, tagnum2name):
          
          for tag, value in self.raw_ifd.items():
              try:
                  tag_name = tagnum2name[tag]
              except KeyError:
                  # Ok, we don't recognize this tag.  Just use the numeric id.
                  msg = 'Unrecognized Exif tag ({tag}).'.format(tag=tag)
                  warnings.warn(msg, UserWarning)
                  tag_name = tag
              self.processed_ifd[tag_name] = value
docs: Map the tag name instead of tag number to the tag value.