[Python-Dev] optimization required: .format() is much slower than % (original) (raw)
Nick Coghlan ncoghlan at gmail.com
Fri May 30 11:47:35 CEST 2008
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Simon Cross wrote:
It struct me as odd that this one case shows such a big difference while the others show less of one.
I believe the %-formatting code has some optimisations in place where it realises it can just increment the reference count of the passed in string and return that, rather than having to build a new string object.
As for why you didn't see any differences in a couple of your tests: the .format() call wasn't actually substituting anything.
Unfortunately, the reasons why .format() doesn't complain about extra arguments never made it into the PEP. They can be found here: http://mail.python.org/pipermail/python-dev/2006-May/065062.html
Cheers, Nick.
-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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