code: def change_back(self):
      if self.workdir is not None:
          os.chdir(self.olddir)
  
imports: from dataclasses import dataclass, field
  import os
  from pathlib import Path
  from typing import Optional
  from snakemake.logging import logger
label_desc: Use image node_id 2 for calling the WorkdirHandler obj's underlying member method code with example usage: obj.change_back() without return types