Er, not as far as I can tell.... the 2.4 feature was what wouldn't work consistently; the corrected version, using list() and reverse(), doesn't look like it has anything that'll be a problem in my 2.2 installation, and probably not in 2.1 ....
What he said :)
Although if you genuinely prefer a functional programming style, I'd go with Terry's answer rather than mine.
(Incidentally, I didn't even know what the reduce trap *was* until Terry described it, but the iterative version avoids it automatically)
Cheers, Nick.
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Nick Coghlan | [EMAIL PROTECTED] | Brisbane, Australia
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http://boredomandlaziness.skystorm.net
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