code: def delete_folder(self, folder_id, recursive=True):
          
          return self.__request("DELETE", "folders/%s" % (folder_id, ),
                          querystring={'recursive': unicode(recursive).lower()})
docs: Delete an existing folder
  
          Args:
              folder_id (int): ID of the folder to delete.
              recursive (bool): Delete all subfolder if True.
  
          Returns:
              dict. Response from Box.
  
          Raises:
              BoxError: An error response is returned from Box (status_code >= 400).
  
              BoxHttpResponseError: Response from Box is malformed.
  
              requests.exceptions.*: Any connection related problem.