[Python-Dev] PEP 572: A backward step in readability

[Guido van Rossum]

TBH I think the text of the PEP could be much improved -- for example it
should use motivating examples from real code, not artificial examples to
show edge cases of the semantics.

At this point I don't think that more people expressing an opinion one way
or another are going to make a difference. Nobody whose vote matters is
going to be convinced either way.

On Mon, Apr 30, 2018 at 9:53 AM, Paul Moore <p.f.moore at gmail.com> wrote:

> On 30 April 2018 at 17:37, Steven D'Aprano <steve at pearwood.info> wrote:
> > On Mon, Apr 30, 2018 at 08:09:35AM +0100, Paddy McCarthy wrote:
> > [...]
> >> A PEP that can detract from readability; *readability*, a central
> >> tenet of Python, should
> >> be rejected, (on principle!), when such objections are treated so
> dismissively.
> >
> > Unless you have an objective measurement of readability, that objection
> > is mere subjective personal preference, and not one that everyone agrees
> > with. I for one think that used wisely, binding expressions will be
> > *more* readable than the alternatives. (Even though := is not my
> > preferred syntax.)
>
> On the other hand, the PEP doesn't do much to address the various
> claims of readability issues. Whether they are subjective or not,
> well-founded or not, the PEP does (in my view) come across as
> unnecessarily dismissive of the question of readability. I suspect
> that's largely due to Chris being extremely tired of having the same
> arguments over and over again, and I can understand that. However, I
> think it could be covered more completely - the remainder of your post
> is exactly the sort of response that would be useful to have recorded.
>
> But one way or another, I think people will vote on the PEP based on
> their (subjective) views, and so readability will get factored into
> the overall response, one way or another. To what extent that response
> affects Guido's final decision (I can't see him delegating on this
> one!) remains to be seen, and honestly, I'm willing to trust Guido's
> intuition.
>
> Paul
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-- 
--Guido van Rossum (python.org/~guido)
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