[Python-Dev] Change to yield-from implementation

Benjamin Peterson benjamin at python.org
Mon Apr 9 14:46:06 CEST 2012

2012/4/9 Greg Ewing <greg.ewing at canterbury.ac.nz>:
> Mark Shannon wrote:
>> We have recently removed the f_yieldfrom field from the frame object.
>> (http://bugs.python.org/issue14230)
> Hey, wait a minute. Did anyone consider the performance effect
> of that change on deeply nested yield-froms?
> The way it was, a yield-from chain was traversed by a very
> tight C loop that found the end frame and resumed it directly.
> If I understand what you've done correctly, now it has to
> enter and execute a bytecode in every frame along the way.

I think correctness is more important that performance, though.


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