fix python 2 & 3 compat

generateDS.py

@@ -6999,11 +6999,17 @@ def makeFile(outFileName):
             reply = input(
                 'File %s exists.  Overwrite? (y/n): ' % outFileName)
             if reply == 'y':
-                outFile = open(outFileName, 'w', encoding="utf-8")
+                if sys.version_info[0] == 2:
+                    outFile = open(outFileName, 'w')
+                else:
+                    outFile = open(outFileName, 'w', encoding="utf-8")
             else:
                 sys.exit('Exiting.  No output file.')
     else:
-        outFile = open(outFileName, 'w', encoding="utf-8")
+        if sys.version_info[0] == 2:
+            outFile = open(outFileName, 'w')
+        else:
+            outFile = open(outFileName, 'w', encoding="utf-8")
     return outFile