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

[Nathaniel Smith]

On Dec 15, 2017 10:50, "Tim Peters" <tim.peters at gmail.com> wrote:

[Eric Snow <ericsnowcurrently at gmail.com>]
> Does that include preserving order after deletion?

Given that we're blessing current behavior:

- At any moment, iteration order is from oldest to newest.  So, "yes"
to your question.

- While iteration starts with the oldest, .popitem() returns the
youngest.  This is analogous to how lists work, viewing a dict
similarly ordered "left to right" (iteration starts at the left,
.pop() at the right, for lists and dicts).


Fortunately, this also matches OrderedDict.popitem().

It'd be nice if we could also support dict.popitem(last=False) to get the
other behavior, again matching OrderedDict.

-n
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