[Python-Dev] PEP520 and absence of definition_order (original) (raw)

Nick Coghlan ncoghlan at gmail.com
Sun Sep 11 22:54:07 EDT 2016

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

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