At 04:41 PM 5/3/05 -0700, Guido van Rossum wrote:
>Given all that, it's not infeasible to add a close() method to
>generators as a shortcut for this:
>
> def close(self):
> try:
> self.__exit__(StopIteration)
> except StopIteration:
> break
> else:
> # __exit__() didn't
> raise RuntimeError("or some other exception")
>
>I'd like the block statement to be defined exclusively in terms of
>__exit__() though.
Sure. PEP 325 proposes a "CloseGenerator" exception in place of
"StopIteration", however, because:
"""
Issues: should StopIteration be reused for this purpose? Probably
not. We would like close to be a harmless operation for legacy
generators, which could contain code catching StopIteration to
deal with other generators/iterators.
"""
I don't know enough about the issue to offer either support or opposition
for this idea, though.
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