On Tue, 12 Feb 2013 13:32:50 -0800 "fwierzbi...@gmail.com" <fwierzbi...@gmail.com> wrote: > On Tue, Feb 12, 2013 at 1:03 PM, Maciej Fijalkowski <fij...@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. _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
