Method is_varret

source/python.js:6418–6421

()

                return this._is_vararg;
            }
            get is_varret() {
                this._parse();
                return this._is_varret;
            }
            argumentIndexWithName(name) {
                const index = this.arguments.findIndex((arg) => arg.name === name);
                return index === -1 ? null : index;