100% disagreement. Err, well, 50%. A property of existing dictionaries is useless. A separate object in, say, collections is more organized.
3rd party libraries can be hard to find, even the great ones. On Mon, Oct 7, 2013 at 3:01 PM, Russell E. Owen <ro...@uw.edu> wrote: > In article <c4c036b6-130c-4718-beb1-a7c923008...@gmail.com>, > Raymond Hettinger <raymond.hettin...@gmail.com> wrote: > > > On Sep 22, 2013, at 6:16 PM, Ethan Furman <et...@stoneleaf.us> wrote: > > > > > Are we close to asking for pronouncement? > > > > When you're ready, let me know. > > > > In the meantime, I conducting usability tests on students in Python > classes > > and researching how well it substitutes for existing solutions for > > case insensitive dictionaries (the primary use case) and for other > > existing cases such as dictionaries with unicode normalized keys. > > > > If you want to participate in the research, I could also use help looking > > at what other languages do. Python is not the first language with > > mappings or to encounter use cases for transforming keys prior > > to insertion and lookup. I would like to find out what work has > > already been done on this problem. > > > > Another consideration is whether the problem is more general > > that just dictionaries. Would you want similar functionality in > > all mapping-like objects (i.e. a persistent dictionaries, os.environ, > etc)? > > Would you want similar functionality for other services > > (i.e. case-insensitive filenames or other homomorphisms). > > > > You can also add to the discussion by trying out your own usability > > tests on people who haven't been exposed to this thread or the pep. > > > > My early results indicate that the API still needs work. > > > >... > > * Another issue is that we're accumulating too many dictionary > > variants and that is making it difficult to differentiate and choose > > between them. I haven't found anyone (even in advanced classes > > with very experienced pythonistas) would knew about > > all the variations: dict, defaultdict, Mapping, MutableMapping, > > mapping views, OrderedDict, Counter, ChainMap, andTransformDict. > > I agree. > > I personally think being able to transform keys would be much more > useful as a property of existing dictionaries. I often use > case-insensitive keys. But I use them with dict and OrderedDict (and > probably ought to use defaultdict, as well). > > TransformDict is neat, but I'd personally be happier seeing this as a > 3rd party library for now. > > -- Russell > > _______________________________________________ > 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/rymg19%40gmail.com > -- Ryan
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