[Python-ideas] New 3.x restriction on number of keyword arguments (original) (raw)

M.-A. Lemburg mal at egenix.com
Tue Oct 26 23:46:38 CEST 2010

Cesare Di Mauro wrote:

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 EXTENDEDARG 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 EXTENDEDARG: 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 EXTENDEDARG: 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 EXTENDEDARG: 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 EXTENDEDARG: 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 EXTENDEDARG: 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 EXTENDEDARG: 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 EXTENDEDARG: 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 EXTENDEDARG: 100000000 loops, best of 1: 0.41 usec per loop I really can't explain it. Ouch!

Looks like a good solution to the problem - no performance loss and a much higher limit on the number of arguments.

-- Marc-Andre Lemburg eGenix.com

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