Index: graphspell/dawg.py
==================================================================
--- graphspell/dawg.py
+++ graphspell/dawg.py
@@ -133,11 +133,11 @@
             oProgBar.increment(1)
         oProgBar.done()
         self.finish()
         self.countNodes()
         self.countArcs()
-        self.sortNodes()
+        self.sortNodes()         # version 2 and 3 
         self.sortNodeArcs(dValOccur)
         #self.sortNodeArcs2 (self.oRoot, "")
         self.displayInfo()
 
     # BUILD DAWG
@@ -472,15 +472,12 @@
         self.pos = DawgNode.NextPos
         DawgNode.NextPos += 1
 
     def __str__ (self):
         # Caution! this function is used for hashing and comparison!
-        l = []
-        if self.final: 
-            l.append("1")
-        else:
-            l.append("0")
+        sFinalChar = "1"  if self.final  else "0";
+        l = [sFinalChar]
         for (key, node) in self.arcs.items():
             l.append(str(key))
             l.append(str(node.i))
         return "_".join(l)