code: def _list_from_env(env_name, default=[]):
      """Returns comma-separated list from environment variable."""
      if env_name in os.environ:
          return os.environ[env_name].split(",")
      return default
  
imports: import io
  import os
  import glob
  import platform
  import re
  import subprocess
  import sys
label_desc: Use image node_id 26 for calling a global function with example usage: _list_from_env(env_name, default) and returns: default, os