old_contents: from mpi4py import MPI
  
  
  comm =  MPI.COMM_WORLD
  rank =  comm.Get_rank()
  
  print rank
  
new_contents: from mpi4py import MPI
  
  
  comm =  MPI.COMM_WORLD
  rank =  comm.Get_rank()
  
  print rank
  
  if rank == 0:
  	comm.send("asdfdfdfd", dest = 1, tag = 0)
  if rank == 1:
  	print comm.rev(source = 0, tag = 0)
  
subject: debug test.py