--- a/plcopen/plcopen.py	Thu Oct 04 11:25:42 2018 +0300
+++ b/plcopen/plcopen.py	Thu Oct 04 12:07:16 2018 +0300
@@ -29,6 +29,7 @@
 import re
 from collections import OrderedDict
 
+from six.moves import xrange
 from lxml import etree
 
 from xmlclass import *