No built-in swap function?

[Christian Tismer]

Tim Peters wrote:

...

> In all CPythons released to date, you'll probably find that
> 
>     temp = v[i]
>     v[i] = v[j]
>     v[j] = temp
> 
> runs faster than
> 
>     v[i], v[j] = v[j], v[i]
> 
> but that's an implementation accident that may get cured in Python 2.4 (it
> has to do with the exact sequence of bytecodes generated, and the latter way
> currently burns time building then tearing apart an intermediate 2-tuple).

And as far as I can remember, Psyco already optimizes the
tuple form. I'd stick with it.

ciao - chris

-- 
Christian Tismer             :^)   <mailto:tismer at stackless.com>
Mission Impossible 5oftware  :     Have a break! Take a ride on Python's
Johannes-Niemeyer-Weg 9a     :    *Starship* http://starship.python.net/
14109 Berlin                 :     PGP key -> http://wwwkeys.pgp.net/
work +49 30 89 09 53 34  home +49 30 802 86 56  mobile +49 173 24 18 776
PGP 0x57F3BF04       9064 F4E1 D754 C2FF 1619  305B C09C 5A3B 57F3 BF04
      whom do you want to sponsor today?   http://www.stackless.com/