code: def editPhotos(self, photos, primary=None):
          
          method = 'flickr.photosets.editPhotos'
  
          if primary is None:
              primary = self.primary
              
          ids = [photo.id for photo in photos]
          if primary.id not in ids:
              ids.append(primary.id)
  
          _dopost(method, auth=True, photoset_id=self.id,\
                  primary_photo_id=primary.id,
                  photo_ids=ids)
          self.__count = len(ids)
          return True
docs: Edit the photos in this set.
  
          photos - photos for set
          primary - primary photo (if None will used current)