[Python-Dev] PEP520 and absence of __definition_order__

[Nick Coghlan]

On 11 September 2016 at 13:05, Nick Coghlan <ncoghlan at gmail.com> wrote:
> VOC & Batavia *should* be OK (worst case, they return
> collections.OrderedDict from __prepare__ and also use it for __dict__
> attributes), but I'm less certain about MicroPython (since I don't
> know enough about how its current dict implementation works to know
> whether or not they'll be able to make the same change PyPy and
> CPython did)

Micropython' s Damien George got back to me and indicated that once
they get around to working on Python 3.6 compatibility (they're
currently still working on 3.5), they'd likely also need to go down
the path of using collections.OrderedDict in the situations where the
3.6 language spec calls for it (MicroPython's default dict
implementation is less sparse than the CPython one, trading greater
memory usage efficiency for an increased risk of hash collisions, so
it's unlikely the new implementation would count as "compact" from
that perspective).

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia