[Python-ideas] Briefer string format

[Alexander Belopolsky]

On Mon, Jul 20, 2015 at 11:35 PM, Tim Peters <tim.peters at gmail.com> wrote:

> >>> dis(f)
>   2           0 LOAD_CONST               3 ('2')
>               3 RETURN_VALUE
>
> That is, the peephole optimizer got rid of "%d" % 2 entirely,
> replacing it with the string constant "2".  So, in all, it's more
> surprising that it takes so long to load a constant ;-)
>

Hmm.  I stand corrected:

$ python3 -mtimeit -s "a=2" "'%s' % a"
10000000 loops, best of 3: 0.124 usec per loop
$ python3 -mtimeit -s "a=2" "'{}'.format(a)"
1000000 loops, best of 3: 0.215 usec per loop

it is 2x rather than 20x speed difference.
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