:meth: download get path of file from pythainlp-corpus
    :param str fname: file name
    :return: path to downloaded file

def _get_path(fname: str) -> str:
    """
    :meth: download get path of file from pythainlp-corpus
    :param str fname: file name
    :return: path to downloaded file
    """
    path = get_corpus_path(fname)
    if not path:
        download(fname)
        path = get_corpus_path(fname)
    return path