> 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. Frankly, I've had enough of this exploration of alternative definitions for sum(), and think it is perfect as it is. -- --Guido van Rossum (home page: http://www.python.org/~guido/)
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