[Python-Dev] Usage of += on strings in loops in stdlib (original) (raw)
Antoine Pitrou solipsis at pitrou.net
Tue Feb 12 22:32:49 CET 2013
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On Tue, 12 Feb 2013 13:32:50 -0800 "fwierzbicki at gmail.com" <fwierzbicki at gmail.com> wrote:
On Tue, Feb 12, 2013 at 1:03 PM, Maciej Fijalkowski <fijall at gmail.com> wrote: > Hi > > We recently encountered a performance issue in stdlib for pypy. It > turned out that someone commited a performance "fix" that uses += for > strings instead of "".join() that was there before. > > Now this hurts pypy (we can mitigate it to some degree though) and > possible Jython and IronPython too. Just to confirm Jython does not have optimizations for += String and will do much better with the idiomatic "".join().
For the record, io.StringIO should be quite fast in 3.3. (except for the method call overhead that Guido is complaining about :-))
Regards
Antoine.
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