code: def __init__(self, fname):
      from dvc.dvcfile import DVC_FILE_SUFFIX, is_dvc_file
  
      msg = f"'{fname}' is not a .dvc file"
  
      sname = fname + DVC_FILE_SUFFIX
      if is_dvc_file(sname):
          msg += f". Do you mean '{sname}'?"
  
      super().__init__(msg)
  
imports: from dvc.exceptions import DvcException
label_desc: Use image node_id 1 to create a new StageFileIsNotDvcFileError object from inherited base classes: DvcException with example: obj = StageFileIsNotDvcFileError(fname)