Hello all, I've discovered a 'feature' of IronPython, that diverges fairly wildly from the Python spec : IronPython 1.0.60420 (Beta) on .NET 2.0.50727.42 Copyright (c) Microsoft Corporation. All rights reserved. >>> 2.0 + "3.5" 5.5 >>> I think it speaks for itself... All the best, Michael Foord http://www.resolversystems.com