Update the code to better reflect recommended style:

Use != instead of <> since <> is documented as "obsolescent".
Use "is" and "is not" when comparing with None or type objects.

Lib/test/test_rotor.py

@@ -13,12 +13,12 @@ print `b`
 
 A1 = r.decrypt(a)
 print A1
-if A1 <> A:
+if A1 != A:
     print 'decrypt failed'
 
 B1 = r.decryptmore(b)
 print B1
-if B1 <> B:
+if B1 != B:
     print 'decryptmore failed'
 
 try: