Adding a hello world for running a python script with MPI.

Author: Jonathan Rocher

MPI/hello_world.py

@@ -0,0 +1,9 @@
+""" Hello world for running a python script on multiple nodes 
+using MPI. Run it with
+$ mpiexec -n 4 python hello_world.py
+"""
+
+from mpi4py import MPI
+import os
+
+print 'Hello, World from %s!' % os.getpid()