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Wed Feb 13 02:25:09 CET 2013 · https://mail.python.org/pipermail/python-dev/2013-February/123998.html

On 13.02.13 02:09, Alexandre Vassalotti wrote:
> On Tue, Feb 12, 2013 at 1:44 PM, Antoine Pitrou <solipsis at pitrou.net 
> <mailto: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.

Ropes have been implemented by Carl-Friedrich Bolz in 2007 as I remember.
No idea what the impact was, if any at all.
Would ropes be an answer (and a simple way to cope with string mutation
patterns) as an alternative implementation, and therefore still justify
the usage of that pattern?

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