code: def getenv(key: str, default: str):
      """Return the value of the environment variable key if it exists,
      or default if it doesn’t.
  
      """
      try:
          return os.getenvb(key.encode(), default.encode()).decode()
      except Exception:
          pass
      try:
          return os.getenv(key, default)
      except Exception:
          pass
      return default
  
imports: import io
  import os
  import random
  import threading
  import time
  from enum import Enum
  from typing import Iterator, List, Optional
  from PIL import JpegImagePlugin
  from lightly.openapi_generated.swagger_client.configuration import Configuration
label_desc: Use image node_id 3 for calling a global function with example usage: getenv(key, default) and returns: default, os, os