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Message: [QUOTE="Dave Angel, post: 5117567"] On 26/9/2013 06:51, Íßêïò wrote: In Python 3.3, but not on a web server, I get: Traceback (most recent call last): Question, do you get the same result on your server? (You can put the Greek string in place of "unknown" of course) If so, then the default value makes no sense; it'll cause an exception if it's ever used. If you insist on sticking to expressions (no try/catch, no if statements), then perhaps you should default to a string representing a domain which will always exist. [/QUOTE]