code: def test_import(self):
      # setting this environment variable will not import deep learning framework
      os.environ["XPARL_igonre_core"] = "true"
      import parl
  
      self.assertFalse("paddle" in sys.modules)
      # remove the environment vaiable and reimport the lib
      del os.environ["XPARL_igonre_core"]
      importlib.reload(parl)
      self.assertTrue("paddle" in sys.modules)
  
imports: import unittest
  import sys
  import os
  import importlib
label_desc: Use image node_id 1 for calling the TestNotImportPaddle obj's underlying member method code with example usage: obj.test_import() without return types