diff -r 2248b9fbab39 Lib/this.py
--- a/Lib/this.py	Fri Nov 15 16:51:48 2013 -0800
+++ b/Lib/this.py	Sat Nov 16 15:32:28 2013 +1100
@@ -23,6 +23,6 @@
 d = {}
 for c in (65, 97):
     for i in range(26):
-        d[chr(i+c)] = chr((i+13) % 26 + c)
+        d[i+c] = (i+13) % 26 + c
 
-print("".join([d.get(c, c) for c in s]))
+print(s.translate(d))