Re: [Python-Dev] Is static typing still optional?

[Eric V. Smith]

On 12/10/2017 5:00 PM, Raymond Hettinger wrote:




On Dec 10, 2017, at 1:37 PM, Eric V. Smith  wrote:

On 12/10/2017 4:29 PM, Ivan Levkivskyi wrote:

On 10 December 2017 at 22:24, Raymond Hettinger 
> wrote:
Without typing (only the first currently works):
 Point = namedtuple('Point', ['x', 'y', 'z'])  #
underlying store is a tuple
 Point = make_dataclass('Point', ['x', 'y', 'z'])  #
underlying store is an instance dict
Hm, I think this is a bug in implementation. The second form should also work.


Agreed.


I've checked this under bpo-32278.



I have a bunch of pending changes for dataclasses. I'll add this.

Eric.


Thanks Eric and Ivan.  You're both very responsive.  I appreciate the enormous 
efforts you're putting in to getting this right.

I suggest two other fix-ups:

1) Let make_dataclass() pass through keyword arguments to _process_class(), so 
that this will work:

 Point = make_dataclass('Point', ['x', 'y', 'z'], order=True)


And I've checked this in under bpo-32279.


2) Change the default value for "hash" from "None" to "False".  This might take 
a little effort because there is currently an oddity where setting hash=False causes it to be hashable.  I'm 
pretty sure this wasn't intended ;-)


I haven't looked at this yet.

Eric.

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Re: [Python-Dev] Whatever happened to 'nonlocal x = y'?

[Benjamin Peterson]

https://github.com/python/peps/commit/2d2ac2d2b66d4e37e8b930f5963735616bddbbe8

On Sat, Jan 6, 2018, at 08:56, Barry Warsaw wrote:
> On Jan 6, 2018, at 11:43, Guido van Rossum  wrote:
> > 
> > Maybe we should not delete them outright but add something like "(UPDATE: 
> > during later discussions it was decided that this feature shouldn't be 
> > added.)"
> 
> +1
> 
> -Barry
> 
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Re: [Python-Dev] Whatever happened to 'nonlocal x = y'?

[Random832]

On Fri, Jan 5, 2018, at 14:07, Guido van Rossum wrote:
> Yeah, but I've changed my mind on this -- I think it's needless added
> complexity that helps save one line of code in very few use cases. And you
> don't really think the PEP endorses `nonlocal foo += 1` do you?

The PEP itself is very clear about supporting "augmented assignment", even 
defining the grammar differently for this case (such that you can't do it with 
multiple names in a single statement). The grammar shown also supports 
"nonlocal foo = bar = baz", though the text doesn't mention this form.
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Re: [Python-Dev] Whatever happened to 'nonlocal x = y'?

[Barry Warsaw]

On Jan 6, 2018, at 11:43, Guido van Rossum  wrote:
> 
> Maybe we should not delete them outright but add something like "(UPDATE: 
> during later discussions it was decided that this feature shouldn't be 
> added.)"

+1

-Barry



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Re: [Python-Dev] Whatever happened to 'nonlocal x = y'?

[Guido van Rossum]

Maybe we should not delete them outright but add something like "(UPDATE:
during later discussions it was decided that this feature shouldn't be
added.)"

On Fri, Jan 5, 2018 at 10:52 PM, Benjamin Peterson 
wrote:

>
>
> On Fri, Jan 5, 2018, at 01:57, Nathaniel Smith wrote:
> > Was this just an oversight, or did it get rejected at some point and
> > no-one remembered to update that PEP?
>
> There was an implementation https://bugs.python.org/issue4199. But
> several years ago, we again reached the conclusion that the feature
> shouldn't be added.
>
> Normally, I think final PEPs shouldn't be updated. But maybe in this case,
> it's worth deleting those lines to avoid future confusion.
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-- 
--Guido van Rossum (python.org/~guido)
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