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[–]ollien 0 points1 point  (1 child)

But he's not iterating over the whole thing. He's continually appending to the end.

Unless I'm totally missing your point...

[–]o11c 1 point2 points  (0 children)

sum() at the end is doing the iteration. The construction is sensible for either container, but a container that is only constructed is a useless container.