code: def get_default_region() -> Optional[str]:
      """Get the default region from gcloud config or environment variables.
  
      Returns:
          str: The default region, or None if it cannot be determined.
      """
      region = get_gcloud_config_value("compute/region")
      if not region:
          region = os.environ.get(GCP_REGION_ENV_VAR)
      return region
  
file_path: wandb/wandb/sdk/launch/environment/gcp_environment.py
imports: import logging
  import os
  import subprocess
  from typing import Optional
  from wandb.sdk.launch.errors import LaunchError
  from wandb.util import get_module
  from ..utils import GCS_URI_RE, event_loop_thread_exec
  from .abstract import AbstractEnvironment
label_desc: Use image node_id 2 for calling a global function with example usage: get_default_region() and returns: region