docs: def photos(self):
          """Copy photos to the destination user."""
          # Reverse because pictures appear in inverse chronological order.
          for photo_info in self.dest_user.profile.photo_infos:
              self.dest_user.photo.delete(photo_info)
          return [self.dest_user.photo.upload_and_confirm(info)
                  for info in reversed(self.source_profile.photo_infos)]