code: def list(self, list_folders=False, list_files=False):
          
  
          a_files = os.listdir(self.folder.path)
          for a_file in a_files:
              path = self.folder.child(a_file)
              if os.path.isdir(path):
                  if list_folders:
                      yield Folder(path)
              elif list_files:
                  if not self.pattern or fnmatch.fnmatch(a_file, self.pattern):
                      yield File(path)
docs: A simple generator that yields a File or Folder object based on
          the arguments.