[Python-ideas] New 3.x restriction on number of keyword arguments

[Cesare Di Mauro]

2010/10/26 Antoine Pitrou <solipsis at pitrou.net>

> On Tue, 26 Oct 2010 19:22:32 +0200
> Cesare Di Mauro
> <cesare.di.mauro at gmail.com> wrote:
> >
> > At this time I have no other ideas to solve this problem.
> >
> > Please, let me know if there's interest on a new patch to implement the
> > "compiler-based" solution.
>
> Have you timed the EXTENDED_ARG solution?
>
> Regards
>
> Antoine.


I made some a few minutes ago, and the results are unbelievable and
counter-intuitive on my machine (Athlon64 2800+ socket 754, 2GB DDR 400,
Windows 7 x64, Python 3.2a3 32 bits running at high priority):

python.exe -m timeit -r 1 -n 100000000 -s "def f(): pass" "f()"
Standard : 100000000 loops, best of 1: 0.348 usec per loop
EXTENDED_ARG: 100000000 loops, best of 1: 0.341 usec per loop

python.exe -m timeit -r 1 -n 100000000 -s "def f(x, y, z): pass" "f(1, 2,
3)"
Standard : 100000000 loops, best of 1: 0.452 usec per loop
EXTENDED_ARG: 100000000 loops, best of 1: 0.451 usec per loop

python.exe -m timeit -r 1 -n 100000000 -s "def f(a = 1, b = 2, c = 3): pass"
"f(a = 1, b = 2, c = 3)"
Standard : 100000000 loops, best of 1: 0.578 usec per loop
EXTENDED_ARG: 100000000 loops, best of 1: 0.556 usec per loop

python.exe -m timeit -r 1 -n 100000000 -s "def f(x, y, z, a = 1, b = 2, c =
3): pass" "f(1, 2, 3, a = 1, b = 2, c = 3)"
Standard : 100000000 loops, best of 1: 0.761 usec per loop
EXTENDED_ARG: 100000000 loops, best of 1: 0.739 usec per loop

python.exe -m timeit -r 1 -n 100000000 -s "def f(*Args): pass" "f(1, 2, 3)"
Standard : 100000000 loops, best of 1: 0.511 usec per loop
EXTENDED_ARG: 100000000 loops, best of 1: 0.508 usec per loop

python.exe -m timeit -r 1 -n 100000000 -s "def f(**Keys): pass" "f(a = 1, b
= 2, c = 3)"
Standard : 100000000 loops, best of 1: 0.789 usec per loop
EXTENDED_ARG: 100000000 loops, best of 1: 0.784 usec per loop

python.exe -m timeit -r 1 -n 100000000 -s "def f(*Args, **Keys): pass" "f(1,
2, 3, a = 1, b = 2, c = 3)"
Standard : 100000000 loops, best of 1: 1.01 usec per loop
EXTENDED_ARG: 100000000 loops, best of 1: 1.01 usec per loop

python.exe -m timeit -r 1 -n 100000000 -s "def f(*Args, **Keys): pass" "f()"
Standard : 100000000 loops, best of 1: 0.393 usec per loop
EXTENDED_ARG: 100000000 loops, best of 1: 0.41 usec per loop

I really can't explain it. Ouch!

Cesare
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