Since when builtin dict preserve key order?

[Marko Rauhamaa]

Chris Angelico <rosuav at gmail.com>:

> On Sat, Mar 24, 2018 at 3:34 PM, Arkadiusz Bulski
> <arek.bulski at gmail.com> wrote:
>> I already asked on PYPY and they confirmed that any version of pypy,
>> including 2.7, has dict preserving insertion order. I am familiar
>> with ordered **kw which was introduced in 3.6 but I also heard that
>> builtin dict preserves order since 3.5. Is that true?
>>
>
> I don't think 3.5 had it. According to the tracker, it landed in 3.6:
>
> https://bugs.python.org/issue27350
>
> But yes, current versions of CPython preserve insertion order.

Is that part of the Python Language Specification? If not, it shouldn't
be exploited in application programs.


Marko