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Fri Oct 7 13:44:13 CEST 2011 · https://mail.python.org/pipermail/python-dev/2011-October/113944.html

Le 07/10/2011 03:19, Steven D'Aprano a écrit :
> Given that strings are immutable, would it not be an obvious
> optimization for replace to return the source string unchanged if the
> old and new substrings are equal, and avoid making a potentially
> expensive copy?

I just implemented this optimization in 9c1b76936b79, but only if old 
and new substrings are the same object (old is new). *Compare* 
substrings (content) would slow down .replace() in most cases.

Victor

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[Python-Dev] New stringbench benchmark results