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Thu Aug 24 00:52:09 CEST 2006 · https://mail.python.org/pipermail/python-dev/2006-August/068498.html

On 8/23/06, Phillip J. Eby wrote:
> Our original
> assumption was that if they could implement throw() then they could clearly
> implement close(), since close() was defined in terms of throw().  An
> asynchronous return might be another matter.

Such asynchronous return can always be implemented via a special
hidden exception that is invisible to catch statements. I.e an
implementation of generators  can still use ___GeneratorExit
internally as long as it is not exposed to scripts.

Regards, Igor

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[Python-Dev] GeneratorExit is unintuitive and uneccessary