io_handling.py 文件源码

def output_filename(source_filename, destination_dir, mode, suffix):
    # type: (str, str, str, str) -> str
    """Duplicates the source filename in the destination directory, adding or stripping
    a suffix as needed.

    :param str source_filename: Full file path to source file
    :param str destination_dir: Full file path to destination directory
    :param str mode: Operating mode (encrypt/decrypt)
    :param str suffix: Suffix to append to output filename
    :returns: Full file path of new destination file in destination directory
    :rtype: str
    """
    if suffix is None:
        suffix = OUTPUT_SUFFIX[mode]
    else:
        _LOGGER.debug('Using custom suffix "%s" to create output file', suffix)
    filename = source_filename.rsplit(os.sep, 1)[-1]
    _LOGGER.debug('Duplicating filename %s into %s', filename, destination_dir)
    return os.path.join(destination_dir, filename) + suffix