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Message: [QUOTE="Steven D'Aprano, post: 5138295"] Alas, I think you've run into one of the weaknesses of doctest. Don't get me wrong, I am a huge fan of doctest, but it is hard to write polyglot string tests with it, as you have discovered. However, you may be able to get 95% of the way by using print. def func(a): """aaa """ return a ought to behave identically in both Python 2 and Python 3.3, provided you only print one object at a time. This ought to work with both ASCII and non-ASCII (at least in the BMP). [/QUOTE]