[Python-Dev] PEP 289 - Generator Expressions - Let's Move For ward
Guido van Rossum
guido at python.org
Tue May 4 19:44:53 EDT 2004
> Alas, the PEP is indeed out of date, and I can't remember exactly
> which set of gimmicks Guido favored. The PEP currently says
> early-binding is the rule, but I *think* Guido favored mostly-late
> binding -- which is late binding, except that the iterable in the
> leftmost for-clause is evaluated at once. So
>
> ... (e1 for stuff in e2 for morestuff in e3 ...) ...
>
> is effectively replaced by
>
> def __g(primary):
> for stuff in primary:
> for morestuff in e3:
> ...
> yield e1
>
> ... __g(e2) ...
Exactly.
> > I'm not fussed if we slip a week or two here, but if
> > it slips another 6 weeks, say, then the release time
> > line could be in some trouble.
>
> Is anyone working (or willing to work) on the PEP, implementation,
> and docs now? I can't make time for it, but if I could I think the
> semantic issues are settled (in Guido's mind, and possibly in some
> email of his I can't find now).
How about this one. :-)
--Guido van Rossum (home page: http://www.python.org/~guido/)
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