diff --git a/tutorial/py.twisted/PythonServer.py b/tutorial/py.twisted/PythonServer.py
index 034e4a3..c3e64db 100755
--- a/tutorial/py.twisted/PythonServer.py
+++ b/tutorial/py.twisted/PythonServer.py
@@ -60,16 +60,10 @@
             val = work.num1 * work.num2
         elif work.op == Operation.DIVIDE:
             if work.num2 == 0:
-                x = InvalidOperation()
-                x.whatOp = work.op
-                x.why = 'Cannot divide by 0'
-                raise x
+                raise InvalidOperation(work.op, 'Cannot divide by 0')
             val = work.num1 / work.num2
         else:
-            x = InvalidOperation()
-            x.whatOp = work.op
-            x.why = 'Invalid operation'
-            raise x
+            raise InvalidOperation(work.op, 'Invalid operation')
 
         log = SharedStruct()
         log.key = logid