code: def _environ() -> Iterator[None]:
      """Fixture to restore the environment after/during tests."""
      with pl.StringCache(), pl.Config(restore_defaults=True):
          yield
  
imports: from __future__ import annotations
  import os
  from pathlib import Path
  from typing import Any, Iterator
  import pytest
  import polars
  import polars.polars
  from polars.config import _POLARS_CFG_ENV_VARS
label_desc: Use image node_id 1 for calling a global function with example usage: _environ() without return types