A question about the posibility of raise-yield in Python

[Carl Banks]

On Jun 30, 12:13 am, Дамјан Георгиевски <gdam... at gmail.com> wrote:
> > I'm writing this as a complete newbie (on the issue), so don't be
> > surprised if it's the stupidest idea ever.
>
> > I was wondering if there was ever a discusision in the python
> > community on a 'raise-yield' kind-of combined expression. I'd like to
> > know if it was proposed/rejected/discussed/not-decided yet??
>
> Recently (ok, several hours ago) I've come up to Greenlets [1] and it
> seems they implement exactly what I was asking for, in a C extension!!
>
> It's too bad that Python doesn't support this by default and many
> libraries won't make use of it by default. Gevent [2] for example, has
> to monkey-patch Python's socket, time.sleep and other modules so that
> things like urllib work with it.
>
> I'll continue to read now.

Ah, if I had seen your original post I probably could have pointed you
to some good reading right away.  What you've described is called a
continuation, and is natively supported by some languages (like
Scheme).  It's usually not done with exceptions, though.  In Scheme
it's a special form that looks like an ordinary function call, but you
can "return" from the call any number of times.

A while back, Stackless Python supported continuations, but it was
removed because (IIRC) it made stackless too platform-dependent (plus
there wasn't much interest).


Carl Banks