log.py 文件源码

def _add_file_handler(logger, filename=None, use_formatter=True):
    if not _has_handler(logger, WatchedFileHandler):
        if filename is None:
            filename = _log_filename
        handler = WatchedFileHandler(filename)

        if use_formatter:
            handler.setFormatter(logging.Formatter(FILE_FORMAT))

        logger.addHandler(handler)