languageflow/file_utils.py
def cached_path(url_or_filename: str, cache_dir: Path) -> Path:
    """
    Given something that might be a URL (or might be a local path),
    determine which. If it's a URL, download the file and cache it, and
    return the path to the cached file. If it's already a local path,
    make sure the file exists and then return the path.
    """
    dataset_cache = Path(CACHE_ROOT) / cache_dir

    parsed = urlparse(url_or_filename)

    if parsed.scheme in ('http', 'https'):
        # URL, so get it from the cache (downloading if necessary)
        return get_from_cache(url_or_filename, dataset_cache)
    elif parsed.scheme == '' and Path(url_or_filename).exists():
        # File, and it exists.
        return Path(url_or_filename)
    elif parsed.scheme == '':
        # File, but it doesn't exist.
        raise FileNotFoundError("file {} not found".format(url_or_filename))
    else:
        # Something unknown
        raise ValueError("unable to parse {} as a URL or as a local path".format(url_or_filename))
def cached_path(url_or_filename: str, cache_dir: Path) -> Path:
    """
    Given something that might be a URL (or might be a local path),
    determine which. If it's a URL, download the file and cache it, and
    return the path to the cached file. If it's already a local path,
    make sure the file exists and then return the path.
    """
    dataset_cache = Path(CACHE_ROOT) / cache_dir

    parsed = urlparse(url_or_filename)

    if parsed.scheme in ('http', 'https'):
        # URL, so get it from the cache (downloading if necessary)
        return get_from_cache(url_or_filename, dataset_cache)
    elif parsed.scheme == '' and Path(url_or_filename).exists():
        # File, and it exists.
        return Path(url_or_filename)
    elif parsed.scheme == '':
        # File, but it doesn't exist.
        raise FileNotFoundError("file {} not found".format(url_or_filename))
    else:
        # Something unknown
        raise ValueError("unable to parse {} as a URL or as a local path".format(url_or_filename))
Given something that might be a URL (or might be a local path),
    determine which. If it's a URL, download the file and cache it, and
    return the path to the cached file. If it's already a local path,
    make sure the file exists and then return the path.