On 9 Oct 2013 01:07, "Antoine Pitrou" <solip...@pitrou.net> wrote: > > Le Tue, 8 Oct 2013 22:49:28 +1000, > Nick Coghlan <ncogh...@gmail.com> a écrit : > > > Well, you could ask the same question about OrderedDict, > > > defaultdict or Weak*Dictionary since neither of them use > > > composition :-) > > > > We *did* ask the same question about those (except the Weak* variants, > > simply due to age). > > > > Each time, the point that each new dict variant would be used to > > justify yet *more* variants was a cause for concern. > > Could you explain? I don't understand.
Just that the comment I replied to is getting very close to the argument "we have so many non-composable mapping variants already, what's the harm in adding one more?". I believe potentially enabling that argument in the future was cited as a downside for all of defaultdict, OrderedDict and Counter. > > "Composition doesn't work with some mappings" isn't an adequate > > answer to the criticism that a composition based design could work > > with more mappings than just the builtin dict. > > Fair enough. > > Regards > > Antoine. > > > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: https://mail.python.org/mailman/options/python-dev/ncoghlan%40gmail.com
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