[Python-ideas] Async API
greg.ewing at canterbury.ac.nz
Sun Oct 28 01:21:35 CEST 2012
Guido van Rossum wrote:
> The example would have to set some flag indicating it has a result
> after the first yield (i.e. before entering the finally, or at least
> before yielding in the finally clause). And the timeout callback would
> have to check this flag. This makes it slightly awkward to design a
> general-purpose timeout mechanism for tasks written in this style --
> if you expect a timeout or cancellation you must protect your cleanup
> code from it by using some API.
This is where having a way to find out whether a generator
is in a finally clause would help. It would allow the scheduler
to take care of this transparently.
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