Remove pypar and non-functional commented code

python/examples/viz_vmd.py

@@ -24,10 +24,10 @@ nfreq = int(sys.argv[2])
 nsteps = int(sys.argv[3])
 
 me = 0
-# uncomment if running in parallel via Pypar
-#import pypar
-#me = pypar.rank()
-#nprocs = pypar.size()
+# uncomment this if running in parallel via mpi4py
+#from mpi4py import MPI
+#me = MPI.COMM_WORLD.Get_rank()
+#nprocs = MPI.COMM_WORLD.Get_size()
 
 from lammps import lammps
 lmp = lammps()
@@ -87,6 +87,5 @@ if me == 0:
   #v.enter()
   #v.stop()
 
-# uncomment if running in parallel via Pypar
+# uncomment if running in parallel via mpi4py
 #print("Proc %d out of %d procs has" % (me,nprocs), lmp)
-#pypar.finalize()