retain compatibility with python 2.x

examples/PACKAGES/cgdna/util/generate.py

@@ -22,6 +22,10 @@
 """
 Import basic modules
 """
+
+# for python2/3 compatibility
+from __future__ import print_function
+
 import sys, os, timeit
 
 from timeit import default_timer as timer

examples/PACKAGES/cgdna/util/generate_simple.py

@@ -1,5 +1,8 @@
 # Setup tool for oxDNA input in LAMMPS format.
 
+# for python2/3 compatibility
+from __future__ import print_function
+
 import math,numpy as np,sys,os
 
 # system size