code: def testReturnCpp(self):
      # Python Created Object With Same Id As
      # Cpp Created B Object
      # b = B(872)
  
      #  Get Reference To Cpp Created B Object
      a = getBCppObj()
  
      # Python Created B Object and Cpp B Object
      # Should have same result by calling f()
      self.assertEqual("B::f()", a.f())
      self.assertEqual("B::f()", call_f(a))
      self.assertEqual("A::f()", call_f(A()))
  
file_path: turicreate/src/external/boost/boost_1_68_0/libs/python/test/polymorphism2.py
imports: import unittest
  import sys
label_desc: Use image node_id 1 for calling the PolymorphTest obj's underlying member method code with example usage: obj.testReturnCpp() without return types