__init__.py 文件源码

def main(args=None):
    parsed_args = parser.parse_args(args=args)
    logger.setLevel(parsed_args.log_level)
    has_attrs = (getattr(parsed_args, "sort_by", None) and
                 getattr(parsed_args, "columns", None))
    if has_attrs and parsed_args.sort_by not in parsed_args.columns:
        parsed_args.columns.append(parsed_args.sort_by)
    try:
        result = parsed_args.entry_point(parsed_args)
    except Exception as e:
        if isinstance(e, NoRegionError):
            msg = "The AWS CLI is not configured."
            msg += " Please configure it using instructions at"
            msg += " http://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-started.html"
            exit(msg)
        elif logger.level < logging.ERROR:
            raise
        else:
            err_msg = traceback.format_exc()
            try:
                err_log_filename = os.path.join(config.user_config_dir, "error.log")
                with open(err_log_filename, "ab") as fh:
                    print(datetime.datetime.now().isoformat(), file=fh)
                    print(err_msg, file=fh)
                exit("{}: {}. See {} for error details.".format(e.__class__.__name__, e, err_log_filename))
            except Exception:
                print(err_msg, file=sys.stderr)
                exit(os.EX_SOFTWARE)
    if isinstance(result, SystemExit):
        raise result
    elif result is not None:
        if isinstance(result, dict) and "ResponseMetadata" in result:
            del result["ResponseMetadata"]
        print(json.dumps(result, indent=2, default=lambda x: str(x)))