code: def do_pickle(self, obj, pickle):
      comm = MPI.COMM_SELF
      o = comm.sendrecv(obj, 0, 0, None, 0, 0)
      self.assertEqual(obj, o)
      s = pickle.dumps(obj)
      o = pickle.loads(s)
      self.assertEqual(obj, o)
  
file_path: mpi4py/test/test_pickle.py
imports: from mpi4py import MPI
  import mpiunittest
  import sys
label_desc: Use image node_id 3 for calling the TestPickle obj's underlying member method code with example usage: obj.do_pickle(obj, pickle) without return types