code: def delete(self, folder_id):
          
          self.folder_id = folder_id
          return self._mc_client._delete(url=self._build_path(folder_id))
docs: Delete a specific campaign folder, and mark all the campaigns in the
          folder as ‘unfiled’.
  
          :param folder_id: The unique id for the campaign folder.
          :type folder_id: :py:class:`str`