diff --git a/pym/install/variables/distr.py b/pym/install/variables/distr.py
index 05c4e55..8e96ceb 100644
--- a/pym/install/variables/distr.py
+++ b/pym/install/variables/distr.py
@@ -23,7 +23,7 @@ from operator import itemgetter
 from calculate.lib.datavars import (Variable, VariableError, ReadonlyVariable,
                                     CommonVariableError)
 from calculate.lib.utils.common import (getSupportArch, getTupleVersion,
-                                        cmpVersion)
+                                        cmpVersion, cmp)
 from calculate.lib.utils.files import listDirectory, pathJoin
 from calculate.lib.variables.linux import Linux
 from ..distr import (Distributive, PartitionDistributive,
@@ -177,11 +177,7 @@ class DistroRepository(Linux):
                    'partdir': -3,
                    'dir': -4}
         
-        # return cmp(mapExts.get(exts[0], -4), mapExts.get(exts[1], -4))
-        #no cmp in python3, instead do (a > b) - (a < b) 
-        return (mapExts.get(exts[0], -4) > mapExts.get(exts[1], -4)) - \
-            (mapExts.get(exts[0], -4) < mapExts.get(exts[1], -4)) 
-        
+        return cmp(mapExts.get(exts[0], -4), mapExts.get(exts[1], -4))
 
 
     @staticmethod