code: def folder_update(self, folder_key, foldername=None, description=None,
                        privacy=None, privacy_recursive=None, mtime=None):
          
          return self.request('folder/update', QueryParams({
              'folder_key': folder_key,
              'foldername': foldername,
              'description': description,
              'privacy': privacy,
              'privacy_recursive': privacy_recursive,
              'mtime': mtime
          }))
docs: folder/update
  
          http://www.mediafire.com/developers/core_api/1.3/folder/#update