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

Nick Coghlan ncoghlan at gmail.com
Wed May 29 01:22:55 EDT 2019

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.


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-dev/attachments/20190529/6ca64ae0/attachment.html>

More information about the Python-Dev mailing list