old_contents: from mpi4py import MPI
  
  comm = MPI.COMM_WORLD
  rank = comm.Get_rank()
  
  if rank == 1:
      data = {'a': 7, 'b': 3.14}
      comm.send(data, dest=0, tag=11)
  elif rank == 0:
      data = comm.recv(source=1, tag=11)
      if data['a'] == 7:
          print("Success with simple MPI code.")
      else:
          print("Uh-oh")
  
new_contents: from mpi4py import MPI
  
  comm = MPI.COMM_WORLD
  rank = comm.Get_rank()
  
  if rank == 1:
      data = {'a': 7, 'b': 3.14}
      comm.send(data, dest=0, tag=11)
  elif rank == 0:
      s = MPI.Status()
      data = comm.recv(source=MPI.ANY_SOURCE, tag=11, status=s)
      if data['a'] == 7 and s.source == 1:
          print("Success with simple MPI code.")
      else:
          print("Uh-oh")
  
subject: Update silly test.