On Wed, Sep 08, 2004 at 09:33:10PM +0200, Samuele Pedroni wrote:
| Clark C. Evans wrote:
| >I was assuming that only calls within the generator to next(), implicit
| >or otherwise, would be suspension points.
|
| I missed that.
*nod* I will fix the PEP.
| >This covers all of my use cases anyway. In the other situations, if
| >they are even useful, don't do that. Convert the SuspendIteration to a
| >RuntimeError, or resume at the previous suspension point?
| >
| >The idea of the PEP was that a nested-generator context provides this
| >limited set of suspension points to make an implementation possible.
|
| then the PEP needs clarification because I had the impression that
|
| def g(src):
| data = src.read()
| yield data
| data = src.read()
| yield data
The data producers would all be iterators, ones that that could
possibly raise SuspendIteration() from within their next() method.
| the read itself could throw a SuspendIteration
If read() did raise a SuspendIteration() exception, then it would
make sense to terminate the generator, perhaps with a RuntimeError.
I just hadn't considered this case. If someone has a clever
solution that makes this case work, great, but its not something
that I was contemplating.
| and upon the sucessive
| next the src.read() itself would be retried.
| But if it's only nexts than
| can be suspension points then the generator would be not resumable in
| this case.
Right.
I was musing (but it's not in the PEP) that, iter() would sprout an
option that let the producer know if it can suspend. If a generator
that was itself called with this suspend flag asked for a child
generator, then the suspend flag would be carried. But this
is a separate issue.
Thanks for thinking about this PEP.
Clark
--
Clark C. Evans Prometheus Research, LLC.
http://www.prometheusresearch.com/
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