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[Python-Dev] [PEP 558] thinking through locals() semantics


On Wed., 29 May 2019, 2:29 pm Guido van Rossum, <guido at python.org> wrote:

> So why is it ?hellish? for JITs if locals() returns a proxy, while
> frame.f_locals being a proxy is okay?
>

As I understand it, they already drop out of compiled mode if they detect
that the code is tinkering with frame objects.

Having a single locals() call de-optimize an entire function would be far
from ideal.

Cheers,
Nick.

)
>
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