code: def export_job(job: V1Job, filename: str) -> bool:
      """exports job as a kubernetes job spec to file
  
      The output format is determined from the file extension.
      (only .json and .yaml are supported)
  
      Args:
      job: V1Job instance
      filename: output file
  
      Returns:
      True on success, False on error
      """
  
      _, ext = os.path.splitext(filename)
  
      if not valid_job_file_ext(ext):
          logging.error(
              "invalid job file extension: {}, must be in {}".format(
                  ext, k.VALID_JOB_FILE_EXT
              )
          )
          return False
  
      with open(filename, "w") as f:
          if ext == ".json":
              json.dump(nonnull_dict(job_to_dict(job)), f, indent=4)
          else:
              yaml.dump(nonnull_dict(job_to_dict(job)), f)
  
      return True
  
imports: from __future__ import absolute_import
  import argparse
  import json
  import logging
  import os
  import pprint
  import re
  from time import sleep
  from typing import Any, Dict, List, Optional
  from urllib.parse import urlencode, urlparse
  import google
  import yaml
  from google.auth._cloud_sdk import get_application_default_credentials_path
  from google.auth._default import _AUTHORIZED_USER_TYPE, _SERVICE_ACCOUNT_TYPE, load_credentials_from_file
  from google.cloud.container_v1 import ClusterManagerClient
  from google.cloud.container_v1.types import Cluster
  from google.oauth2 import service_account
  from googleapiclient import discovery
  from kubernetes.client import V1Job
  from kubernetes.client.api_client import ApiClient
  from yaspin import yaspin
  from yaspin.spinners import Spinners
  import caliban.platform.gke.constants
  from caliban.platform.cloud.types import GPU, TPU, GPUSpec, TPUSpec
  from caliban.platform.gke.types import CredentialsData, NodeImage, OpStatus
label_desc: Use image node_id 21 for calling a global function with example usage: export_job(job, filename) and returns: True, False