[Python-Dev] optimization required: .format() is much slower than % (original) (raw)
Nick Coghlan ncoghlan at gmail.com
Thu May 29 15:44:01 CEST 2008
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skip at pobox.com wrote:
Nick> $ ./python -m timeit "'' % ()" Nick> 1000000 loops, best of 3: 0.389 usec per loop
vs. Nick> $ ./python -m timeit "'%s' % 'nothing'" Nick> 10000000 loops, best of 3: 0.0736 usec per loop I think you need to use a tuple for the second case to make it comparable to the first.
It doesn't actually make that big a difference - I'm guessing a Py_INCREF shortcut ends up getting used either way:
$ ./python -m timeit "'%s' % 'nothing'" 10000000 loops, best of 3: 0.0848 usec per loop $ ./python -m timeit "'%s' % 'nothing'," 10000000 loops, best of 3: 0.133 usec per loop $ ./python -m timeit "'' % ()" 1000000 loops, best of 3: 0.513 usec per loop
(times are a bit variable at this very moment since I have a few different apps open)
Cheers, Nick.
-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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