def list_folders(self):
        """Return a list of folder names."""
        result = []
        for entry in os.listdir(self._path):
            if len(entry) > 1 or entry[0] == '.' and \
               os.path.isdir(os.path.join(self._path, entry)):
                result.append(entry[1:])
        return result
dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/Maildir.list_folders/operator `and` -> `or`