I think this is an interesting idea, and I don't believe that either
performance or "sortable vs comparable" are very relevant. I doubt there
is much performance to gain here, and I think the default sort order for
a class must continue to match its comparison behavior.
I think the case in favor
04.12.17 01:06, Chris Barker пише:
So: has this already been brought up and rejected?
https://bugs.python.org/issue20632
Am I imagining the performance benefits?
This will add an additional overhead. This will be even slower than
passing the key function, since you will need to look up
And if this is a method on a custom *collection*, it can do whatever it
wants in MyCollection.sort() already.
On Dec 3, 2017 7:14 PM, "David Mertz" wrote:
> I'm not sure I understand the motivation to make elements *sortable* but
> not comparable. If an arbitrary order is still
On Sun, Dec 3, 2017 at 3:06 PM, Chris Barker wrote:
>
> However, if you are writing a custom class ...
>
> But what if there was a sort key magic method:
>
> __key__ or __sort_key__ (or whatever)
>
> that would be called by the sorting functions
>
> It seems this would
On Sun, Dec 03, 2017 at 06:46:45PM -0500, Nathan Schneider wrote:
> On Sun, Dec 3, 2017 at 6:06 PM, Chris Barker wrote:
>
> > In fact, it's striking me that there may well be classes that are defining
> > the comparison magic methods not because they want the objects to
On Sun, Dec 03, 2017 at 03:06:02PM -0800, Chris Barker wrote:
> Recent python has moved toward a "key" function for customized sorting:
>
> list.sort(key=key_fun)
>
> key is also used (according to
> https://docs.python.org/3.6/library/functools.html#functools.cmp_to_key) in:
>
> min(), max(),
On Sun, Dec 3, 2017 at 6:06 PM, Chris Barker wrote:
> In fact, it's striking me that there may well be classes that are defining
> the comparison magic methods not because they want the objects to "work"
> with the comparison operators, but because that want them to work
I can't believe this hasn't been brought up before, but searching the web,
and python-ideas, and all the PEPs has found nothing (could be my lame
google-fu), so here goes:
Recent python has moved toward a "key" function for customized sorting:
list.sort(key=key_fun)
key is also used (according
On 3 December 2017 at 21:36, Ronald Oussoren wrote:
>
>
>> On 3 Dec 2017, at 03:58, Nick Coghlan wrote:
>>
>> On 2 December 2017 at 01:12, Ronald Oussoren wrote:
>>> On 1 Dec 2017, at 12:29, Nick Coghlan
> On 3 Dec 2017, at 03:58, Nick Coghlan wrote:
>
> On 2 December 2017 at 01:12, Ronald Oussoren wrote:
>> On 1 Dec 2017, at 12:29, Nick Coghlan wrote:
>>> 2. Define it as a class method, but have the convention be for the
>>>
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