code: def tearDownClass(cls):
      del cls.data
      del cls.close
      del cls.islong
      del cls.pctret
      del cls.logret
  
file_path: pandas-ta/tests/test_indicator_performance.py
imports: from .config import sample_data
  from .context import pandas_ta
  from unittest import TestCase
  from pandas import Series
label_desc: Use image node_id 2 for calling the TestPerformace obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types