I guess that leaves Alex's question of whether or not supplying a string of some description as the initial value can be legitimately translated to:
if isinstance(initial, basestring): return initial + type(initial)().join(seq)
If you're trying to get people in the habit of writing sum(x, "") instead of "".join(x), I fear that they'll try sum(x, " ") instead of " ".join(x), and be sadly disappointed.
That works for me as a reason not to provide this feature.
It's somewhat heartening when discussions like this turn out to show that the original design was right after all :)
Cheers, Nick.
--
Nick Coghlan | [EMAIL PROTECTED] | Brisbane, Australia
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http://boredomandlaziness.skystorm.net
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