+ def get_indexfile(self, indexfile: Optional[str]) -> str:
+ if indexfile is None:
+ if 'unscrambler_default_indexfile' in config.config:
+ indexfile = config.config['unscramble_indexfile']
+ else:
+ indexfile = "/usr/share/dict/sparse_index"
+ else:
+ assert file_utils.file_is_readable(indexfile), f"Can't read {indexfile}"
+ return indexfile
+