code: def rename_gallery_file(self, file_id, new_file_name, scope='content/write'):
          
          return _put(
              token=self.oauth.get_user_token(scope),
              uri='/user/media/file/' + urllib.quote(file_id),
              data=new_file_name
          )
docs: Rename a file in the Mxit user's gallery
          User authentication required with the following scope: 'content/write'