[Python-Dev] Usage of += on strings in loops in stdlib

[Alexandre Vassalotti]

On Tue, Feb 12, 2013 at 1:44 PM, Antoine Pitrou <solipsis at pitrou.net> wrote:

> It's idiomatic because strings are immutable (by design, not because of
> an optimization detail) and therefore concatenation *has* to imply
> building a new string from scratch.
>

Not necessarily. It is totally possible to implement strings such they are
immutable and  concatenation takes O(1): ropes are the canonical example of
this.
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