code: def tearDownClass(cls):
      del cls.open
      del cls.high
      del cls.low
      del cls.close
      if hasattr(cls, "volume"):
          del cls.volume
      del cls.data
  
imports: from .config import error_analysis, sample_data, CORRELATION, CORRELATION_THRESHOLD, VERBOSE
  from .context import pandas_ta
  from unittest import skip, TestCase
  import pandas.testing
  from pandas import DataFrame, Series
  import talib
label_desc: Use image node_id 2 for calling the TestStatistics obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types