code: def get_backends_from_env() -> List[str]:
      return os.environ.get("STAN_BACKEND", "CMDSTANPY").split(",")
  
imports: import os
  import platform
  from pathlib import Path
  from shutil import copy, copytree, rmtree
  from typing import List
  import tempfile
  from setuptools import find_packages, setup, Extension
  from setuptools.command.build_ext import build_ext
  from setuptools.command.build_py import build_py
  from setuptools.command.editable_wheel import editable_wheel
  from wheel.bdist_wheel import bdist_wheel
label_desc: Use image node_id 6 for calling a global function with example usage: get_backends_from_env() and returns: os