code: def tearDownClass(cls) -> None:
      shutil.rmtree(str(DATA_DIR.resolve()))
  
imports: import sys
  import qlib
  import shutil
  import unittest
  import pytest
  import pandas
  import baostock
  from pathlib import Path
  from qlib.data import D
  from qlib.tests.data import GetData
  from dump_pit import DumpPitData
  from collector import Run
label_desc: Use image node_id 1 for calling the TestPIT obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types