[Python-Dev] PEP 289 - Generator Expressions - Let's Move Forward
Jeremy Hylton
jeremy at alum.mit.edu
Fri Apr 23 16:10:39 EDT 2004
On Fri, 2004-04-23 at 15:59, Phillip J. Eby wrote:
> At 03:41 PM 4/23/04 -0400, Jeremy Hylton wrote:
>
> >That leads me to wonder what exactly the rationale for generator
> >expressions is. The PEP says that "time, clarity, and memory are
> >conserved by using an generator expression" but I can only see how
> >memory is conserved. That is, I don't find them any easier to read than
> >list comprehensions and I don't understand the performance implications
> >very well. It's not obvious to me that their faster.
>
> Alex Martelli previously posted some tests that showed them to be quite a
> bit faster for large lists.
Anyone know where to find these numbers. I've done some searching, but
I can't find them. It would be good to include something concrete in
the PEP.
Jeremy
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