code: def addTags(self, tags):
          
          method = 'flickr.photos.addTags'
          if isinstance(tags, list):
              tags = uniq(tags)
  
          _dopost(method, auth=True, photo_id=self.id, tags=tags)
          #load properties again
          self._load_properties()
docs: Adds the list of tags to current tags. (flickr.photos.addtags)