code: def tearDownClass(cls):
      if cls.session is not None:
          cls.session.close()
  
imports: from .context import yfinance
  from .context import session_gbl
  import unittest
  import os
  import datetime
  import pytz
  import numpy
  import pandas
label_desc: Use image node_id 2 for calling the TestPriceHistory obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types