Set metadata for photo. (flickr.photos.setMeta)

def setMeta(self, title=None, description=None):
        """Set metadata for photo. (flickr.photos.setMeta)"""
        method = 'flickr.photos.setMeta'

        if title is None:
            title = self.title
        if description is None:
            description = self.description
            
        _dopost(method, auth=True, title=title, \
               description=description, photo_id=self.id)
        
        self.__title = title
        self.__description = description