[Python-Dev] Guarantee ordered dict literals in v3.7? (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Sun Nov 5 15🔞24 EST 2017

On Sun, 5 Nov 2017 21:06:12 +0100 Stefan Krah <stefan at bytereef.org> wrote:

On Sun, Nov 05, 2017 at 09:35:38PM +0200, Serhiy Storchaka wrote: > 05.11.17 21:20, Stefan Krah пише: > >On Sun, Nov 05, 2017 at 09:01:40PM +0200, Serhiy Storchaka wrote: > >>Do you suggest to make dictionary displays producing OrderedDict > >>instead of dict? > > > >No, this is essentially a language spec doc issue that would guarantee > >the ordering properties of the current dict implementation. > > Wouldn't be enough to guarantee just the ordering of dicts before > first deletion? Or before first resizing (the maximal size of > dictionary displays is known at compile time, so they can be > presized)?

Yes, for my use case that would be sufficient and that's what I had in mind initially.

A luxury syntax addition like {a = 10, b = {c = "foo"}} that is read as an OrderedDict (where the keys a, b, c are implicitly strings) would of course also be sufficient for my use case.

Or you are ok with:

OD = OrderedDict

...

OD(a=10, b=OD(c="foo"))

Regards

Antoine.

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