def list(self, list_folders=False, list_files=False):
        """
        A simple generator that yields a File or Folder object based on
        the arguments.
        """

        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)
A simple generator that yields a File or Folder object based on
        the arguments.