diff --git a/DDCore/python/lcdd.py b/DDCore/python/lcdd.py
index 0f62786d2d058a4cd21d3ce2b15c394ab2a47152..b7d110ad0748e69d29e86d15b1cafa87435668b2 100644
--- a/DDCore/python/lcdd.py
+++ b/DDCore/python/lcdd.py
@@ -15,7 +15,8 @@ from os import path, listdir
 from functools import partial
 import SystemOfUnits
 import math
-import logging
+import logging
+from six.moves import range
 from ROOT import SetOwnership, dd4hep, TGeoMixture, TGeoMedium, gGeoManager, TNamed
 
 logging.basicConfig(format='%(levelname)s: %(message)s')
diff --git a/DDG4/python/DDSim/Helper/Action.py b/DDG4/python/DDSim/Helper/Action.py
index c4348f099a95e01c3a5bd58b64f9d5b58a16c913..bc4ac31237beca183ebd017d8118557ed6321f55 100644
--- a/DDG4/python/DDSim/Helper/Action.py
+++ b/DDG4/python/DDSim/Helper/Action.py
@@ -3,6 +3,7 @@
 
 from __future__ import absolute_import, unicode_literals
 from DDSim.Helper.ConfigHelper import ConfigHelper
+from six.moves import range
 
 class Action( ConfigHelper ):
   """Action holding sensitive detector actions
@@ -67,7 +68,7 @@ class Action( ConfigHelper ):
       vals = val
     if len(vals)%2 != 0:
       raise RuntimeError("Not enough parameters for mapActions")
-    for index in xrange(0,len(vals),2):
+    for index in range(0,len(vals),2):
       self._mapActions[vals[index]] = vals[index+1]
 
   def clearMapActions( self ):
diff --git a/DDG4/python/DDSim/Helper/Filter.py b/DDG4/python/DDSim/Helper/Filter.py
index 51de3c1ecb25d0e71d8decc5321385f5f01d96c9..587c2e959866ef16ecf9d27e45f53db814f398a6 100644
--- a/DDG4/python/DDSim/Helper/Filter.py
+++ b/DDG4/python/DDSim/Helper/Filter.py
@@ -9,6 +9,7 @@ from __future__ import absolute_import, unicode_literals
 from DDSim.Helper.ConfigHelper import ConfigHelper
 from g4units import keV
 import logging
+from six.moves import range
 
 logging.basicConfig(format='%(levelname)s: %(message)s')
 logger = logging.getLogger(__name__)
@@ -88,7 +89,7 @@ class Filter( ConfigHelper ):
       vals = val
     if len(vals)%2 != 0:
       raise RuntimeError("Not enough parameters for mapDetFilter")
-    for index in xrange(0,len(vals),2):
+    for index in range(0,len(vals),2):
       self._mapDetFilter[vals[index]] = vals[index+1]
 
   def resetFilter( self ):
diff --git a/GaudiPluginService/python/GaudiPluginService/cpluginsvc.py b/GaudiPluginService/python/GaudiPluginService/cpluginsvc.py
index 9728147bf6a11417073e64c40e4fcbbc5bccac08..451ffee156e0da4ef8037bf06ab91d08fb6e6073 100644
--- a/GaudiPluginService/python/GaudiPluginService/cpluginsvc.py
+++ b/GaudiPluginService/python/GaudiPluginService/cpluginsvc.py
@@ -1,5 +1,6 @@
 # cpluginsvc is a ctypes-based wrapper for the C-exposed API of GaudiPluginService
 from __future__ import absolute_import, unicode_literals, print_function
+from six.moves import range
 __doc__ = '''
 cpluginsvc is a ctypes-based wrapper for the C-API of the GaudiPluginService.
 
diff --git a/examples/AlignDet/drivers/Shelf.py b/examples/AlignDet/drivers/Shelf.py
index 1a28f53a90ca0ce62c045af12fa4895c8f996832..849d80f3e85802ad9d20d10751f92dab4cd7bf8c 100644
--- a/examples/AlignDet/drivers/Shelf.py
+++ b/examples/AlignDet/drivers/Shelf.py
@@ -1,4 +1,5 @@
 from __future__ import absolute_import, unicode_literals
+from six.moves import range
 
 def detector_Shelf(description, det):
 
diff --git a/examples/CLICSiD/scripts/CLICRandom.py b/examples/CLICSiD/scripts/CLICRandom.py
index 9676ddef82d733c8c7259cf7dd4ac6b93bce8296..dfa6b15e5bc76d8f84048443f4757e8f195d8d74 100644
--- a/examples/CLICSiD/scripts/CLICRandom.py
+++ b/examples/CLICSiD/scripts/CLICRandom.py
@@ -10,6 +10,7 @@ from ROOT import TRandom
 from ROOT import gRandom
 
 import logging
+from six.moves import range
 
 logging.basicConfig(format='%(levelname)s: %(message)s')
 logger = logging.getLogger(__name__)
@@ -45,23 +46,23 @@ if __name__ == "__main__":
 
   rndm.setSeed(1234)
   rndm.showStatus()
-  for i in xrange(10):
+  for i in range(10):
     logger.info("%s  -- 0 gRandome.Rndm()        -- Shoot random[[%d]= %f",rndm.name(),i,gRandom.Rndm())
   
   rndm.setSeed(1234)
-  for i in xrange(10):
+  for i in range(10):
     logger.info("%s  -- 1 gRandome.Rndm()        -- Shoot random[[%d]= %f",rndm.name(),i,gRandom.Rndm())
   
   rndm.setSeed(1234)
-  for i in xrange(10):
+  for i in range(10):
     logger.info("%s  -- 2 Geant4Random(CLHEP)    -- Shoot random[[%d]= %f",rndm.name(),i,rndm.rndm_clhep())
   
   rndm.setSeed(1234)
-  for i in xrange(10):
+  for i in range(10):
     logger.info("%s  -- 3 Geant4Random(CLHEP)    -- Shoot random[[%d]= %f",rndm.name(),i,rndm.rndm_clhep())
 
   rndm.setSeed(1234)
-  for i in xrange(10):
+  for i in range(10):
     logger.info("%s  -- 4 HepRandomEngine(CLHEP) -- Shoot random[%d]= %f",rndm.name(),i,rndm.engine().flat())
   
   sid.test_run(have_geo=False)
diff --git a/examples/ClientTests/scripts/MultiCollections.py b/examples/ClientTests/scripts/MultiCollections.py
index 34be915e9a99d235b5260b0560b8862641441401..07a0e735180541b3518fae5dff16679b447c6f9b 100644
--- a/examples/ClientTests/scripts/MultiCollections.py
+++ b/examples/ClientTests/scripts/MultiCollections.py
@@ -2,6 +2,7 @@ from __future__ import absolute_import, unicode_literals
 import os, sys, time, DDG4
 from DDG4 import OutputLevel as Output
 from SystemOfUnits import *
+from six.moves import range
 #
 #
 """
@@ -19,7 +20,7 @@ def run():
   geometry = "file:"+install_dir+"/examples/ClientTests/compact/MultiCollections.xml"
   kernel.setOutputLevel(str('Geant4Converter'),Output.DEBUG)
   kernel.setOutputLevel(str('Gun'),Output.INFO)
-  for i in xrange(len(sys.argv)):
+  for i in range(len(sys.argv)):
     if sys.argv[i]=='-compact':
       geometry = sys.argv[i+1]
     elif sys.argv[i]=='-input':
diff --git a/examples/ClientTests/scripts/MultiSegmentCollections.py b/examples/ClientTests/scripts/MultiSegmentCollections.py
index f1a2ff9a1a3a80dc5af7cbee8af5e2153fe6f4f0..eec0718d162dbd5d314a4d0f5202a21f64b867b5 100644
--- a/examples/ClientTests/scripts/MultiSegmentCollections.py
+++ b/examples/ClientTests/scripts/MultiSegmentCollections.py
@@ -2,6 +2,7 @@ from __future__ import absolute_import, unicode_literals
 import os, sys, time, DDG4
 from DDG4 import OutputLevel as Output
 from SystemOfUnits import *
+from six.moves import range
 #
 #
 """
@@ -19,7 +20,7 @@ def run():
   geometry = "file:"+install_dir+"/examples/ClientTests/compact/MultiSegmentCollections.xml"
   kernel.setOutputLevel(str('Geant4Converter'),Output.DEBUG)
   kernel.setOutputLevel(str('Gun'),Output.INFO)
-  for i in xrange(len(sys.argv)):
+  for i in range(len(sys.argv)):
     if sys.argv[i]=='-compact':
       geometry = sys.argv[i+1]
     elif sys.argv[i]=='-input':
diff --git a/examples/DDCMS/scripts/CMSTrackerSim.py b/examples/DDCMS/scripts/CMSTrackerSim.py
index 632f7fb9378f9c7a6085fd740ae766d6cbfa4f5c..ff0d50e5d20d247c6966fa692b85bfc91cdd5d33 100644
--- a/examples/DDCMS/scripts/CMSTrackerSim.py
+++ b/examples/DDCMS/scripts/CMSTrackerSim.py
@@ -3,6 +3,7 @@ import os, sys, time, DDG4
 from DDG4 import OutputLevel as Output
 from SystemOfUnits import *
 import logging
+from six.moves import range
 
 logging.basicConfig(format='%(levelname)s: %(message)s')
 logger = logging.getLogger(__name__)
@@ -30,7 +31,7 @@ def run():
   geant4.setupCshUI()
   batch = False
   test  = False
-  for i in xrange(len(sys.argv)):
+  for i in range(len(sys.argv)):
     arg = sys.argv[i].lower()
     if arg == 'batch':
       batch = True
diff --git a/examples/LHeD/scripts/LHeDRandom.py b/examples/LHeD/scripts/LHeDRandom.py
index d0f28248771609a2f792b4241ae2c66a90bdf320..8b5a44bb9732b5474666ab167b5db64bb0c586e3 100644
--- a/examples/LHeD/scripts/LHeDRandom.py
+++ b/examples/LHeD/scripts/LHeDRandom.py
@@ -9,6 +9,7 @@ from __future__ import absolute_import, unicode_literals
 from ROOT import TRandom
 from ROOT import gRandom
 import logging
+from six.moves import range
 
 logging.basicConfig(format='%(levelname)s: %(message)s')
 logger = logging.getLogger(__name__)
@@ -43,23 +44,23 @@ if __name__ == "__main__":
 
   rndm.setSeed(1234)
   rndm.showStatus()
-  for i in xrange(10):
+  for i in range(10):
     logger.info("%s  -- 0 gRandome.Rndm()        -- Shoot random[[%d]= %f",rndm.name(),i,gRandom.Rndm())
   
   rndm.setSeed(1234)
-  for i in xrange(10):
+  for i in range(10):
     logger.info("%s  -- 1 gRandome.Rndm()        -- Shoot random[[%d]= %f",rndm.name(),i,gRandom.Rndm())
   
   rndm.setSeed(1234)
-  for i in xrange(10):
+  for i in range(10):
     logger.info("%s  -- 2 Geant4Random(CLHEP)    -- Shoot random[[%d]= %f",rndm.name(),i,rndm.rndm_clhep())
   
   rndm.setSeed(1234)
-  for i in xrange(10):
+  for i in range(10):
     logger.info("%s  -- 3 Geant4Random(CLHEP)    -- Shoot random[[%d]= %f",rndm.name(),i,rndm.rndm_clhep())
 
   rndm.setSeed(1234)
-  for i in xrange(10):
+  for i in range(10):
     logger.info("%s  -- 4 HepRandomEngine(CLHEP) -- Shoot random[%d]= %f",rndm.name(),i,rndm.engine().flat())
   
   lhed.test_run(have_geo=False)