code: def testExcl(self):
      group = self.GROUP.Excl([])
      self.assertEqual(MPI.Group.Compare(group, self.GROUP), MPI.IDENT)
      group.Free()
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 8 for calling the BaseTestGroup obj's underlying member method code with example usage: obj.testExcl() without return types