Re: [pygame] 2D vector class

[Richard Jones <richardjones@xxxxxxxxxxxxxxxx>]

On Tuesday 15 August 2006 04:49, Brian Fisher wrote:
> On 8/14/06, Alex Holkner <aholkner@xxxxxxxxxxxxxx> wrote:
> > Thanks Brian for writing the very useful benchmark script, I'll be
> > keeping an eye on it during development.  I expect you'll get the same
> > performance I am if you use __slots__, a minor change.
>
> Hmmm.. I had tried using __slots__ on the class early on, thinking it
> would potentially be the best python thing you could do because then
> your attributes are allocated in your object... when I tested it on
> python 2.3 on WinXP it seemed to be about the same performance as
> using a list member... it disappointed me at the time because I really
> thought it was the best way to go...

Until recently __slots__ could actually perform slower than regular 
attributes. A *lot* of optimisation effort went into Python 2.5 (including a 
dedicated Sprint for a week in Iceland with a dozen devs focusing on speed).


    Richard