In article
<CAPTjJmoZHLfT3G4eqV+=zcvbpf65fkcmah9h_8p162uha7f...@mail.gmail.com>,
Chris Angelico <ros...@gmail.com> wrote:
> On Mon, Jul 14, 2014 at 12:04 AM, Jason R. Coombs <jar...@jaraco.com> wrote:
> > I can achieve what I need by constructing a set on the âitemsâ of the
> > dict.
> >
> >>>> set(tuple(doc.items()) for doc in res)
> >
> > {(('n', 1), ('err', None), ('ok', 1.0))}
>
> This is flawed; the tuple-of-tuples depends on iteration order, which
> may vary. It should be a frozenset of those tuples, not a tuple. Which
> strengthens your case; it's that easy to get it wrong in the absence
> of an actual frozendict.
I would love to see frozendict in python.
I find myself using dicts for translation tables, usually tables that
should not be modified. Documentation usually suffices to get that idea
across, but it's not ideal.
frozendict would also be handy as a default values for function
arguments. In that case documentation isn't enough and one has to resort
to using a default value of None and then changing it in the function
body.
I like frozendict because I feel it is expressive and adds some safety.
-- Russell
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