[Python-Dev] PEP 414 - Unicode Literals for Python 3 (original) (raw)

Armin Ronacher armin.ronacher at active-4.com
Sun Feb 26 13:42:53 CET 2012

Hi,

On 2/26/12 12:35 PM, Serhiy Storchaka wrote:

Some microbenchmarks:

$ python -m timeit -n 10000 -r 100 -s "x = 123" "'foobarbaz%d' % x" 10000 loops, best of 100: 1.24 usec per loop $ python -m timeit -n 10000 -r 100 -s "x = 123" "str('foobarbaz%d') % x" 10000 loops, best of 100: 1.59 usec per loop $ python -m timeit -n 10000 -r 100 -s "x = 123" "str(u'foobarbaz%d') % x" 10000 loops, best of 100: 1.58 usec per loop $ python -m timeit -n 10000 -r 100 -s "x = 123; n = lambda s: s" "n('foobarbaz_%d') % x" 10000 loops, best of 100: 1.41 usec per loop $ python -m timeit -n 10000 -r 100 -s "x = 123; s = 'foobarbaz%d'" "s % x" 10000 loops, best of 100: 1.22 usec per loop There are no significant overhead to use converters. That's because what you're benchmarking here more than anything is the overhead of eval() :-) See the benchmark linked in the PEP for one that measures the actual performance of the string literal / wrapper.

Regards, Armin

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