[Python-ideas] ``with from`` statement

[Guido van Rossum]

Nick already proposed "with (yield from ...): ..."

Maybe in 3.4 we can tweak the syntax so the paresns are not needed.

I am quite glad that we had the foresight (when we designed 'with') to make
this possible.

On Saturday, December 22, 2012, Andrew Svetlov wrote:

> Crazy idea.
> Guido van Rossum mentioned after working on PEP 3156 that context
> managers cannot use
> yield from statement inside __enter__ and __exit__ magic methods.
> Explicit call for entering and leaving context (for locking for
> example) is not convenient.
>
> What do you think about
>
> with from f():
>    do_our_work()
>
>
> ``with from ...` construction calls __enter_from__ generator  and
> iterates via ``yield from`` for that.
> Returned value is our context manager.
>
> The same for __exit_from__ — do``yield from`` for that and stop on
> StopIteration or exception.
>
> --
> Thanks,
> Andrew Svetlov
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>


-- 
--Guido van Rossum (python.org/~guido)
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