utils.py 文件源码

def get_client_class(api_name, version, version_map):
    try:
        client_path = version_map[str(version)]
    except (KeyError, ValueError):
        msg = _("Invalid %(api_name)s client version '%(version)s'. must be "
                "one of: %(map_keys)s")
        msg = msg % {'api_name': api_name, 'version': version,
                     'map_keys': ', '.join(version_map.keys())}
        raise exceptions.UnsupportedVersion(msg)

    return importutils.import_class(client_path)