Re: [Python-Dev] PEP 558: Defined semantics for locals()

2019年5月26日 04:56:43 -0700

On 2019年5月26日 at 12:23, Chris Angelico <[email protected]> wrote:
>
> On Sun, May 26, 2019 at 8:07 PM Steven D'Aprano <[email protected]> wrote:
> > On Sun, May 26, 2019 at 08:44:33AM +1000, Chris Angelico wrote:
> >
> > > From my reading of the description, you could also "assert a is b" -
> > > is that correct?
> >
> > Yes, that's already the behaviour.
> >
> > py> def demo():
> > ... a = locals()
> > ... b = locals()
> > ... print(a is b)
> > ...
> > py> demo()
> > True
> >
>
> Sure, but this PEP is all about defining things that weren't
> previously defined, so I wanted to clarify intent rather than current
> behaviour.
+1 on the PEP being explicit over this. Even though it's current
behaviour, it's surprising and making a clear and definitive statement
that the PEP intends to make the behaviour part of the language
definition and not just a CPython detail, is IMO worthwhile.
Paul
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