[Python-Dev] Guarantee ordered dict literals in v3.7?

[Tim Delaney]

On 6 November 2017 at 06:09, Serhiy Storchaka <storchaka at gmail.com> wrote:

> 05.11.17 20:39, Stefan Krah пише:
>
>> On Sun, Nov 05, 2017 at 01:14:54PM -0500, Paul G wrote:
>>
>>> 2. Someone invents a new arbitrary-ordered container that would improve
>>> on the memory and/or CPU performance of the current dict implementation
>>>
>>
>> I would think this is very unlikely, given that the previous dict
>> implementation
>> has always been very fast. The new one is very fast, too.
>>
>
> The modification of the current implementation that don't preserve the
> initial order after deletion would be more compact and faster.


I would personally be happy with this as the guarantee (it covers dict
literals and handles PEP 468), but it might be more confusing. "dicts are
in arbitrary order" and "dicts maintain insertion order" are fairly simple
to explain, "dicts maintain insertion order up to the point that a key is
deleted" is less so.

Tim Delaney
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