[Python-ideas] Add orderedset as set(iterable, *, ordered=False) and similarly for frozenset.

[Chris Angelico]

On Sun, Feb 8, 2015 at 12:07 PM, Ed Kellett <edk141 at gmail.com> wrote:
> On Sun Feb 08 2015 at 12:52:56 AM Chris Angelico <rosuav at gmail.com> wrote:
>>
>> To be quite honest, I would be very happy if sets had more of the
>> operations that dictionaries have. Imagine if "set" were "dictionary
>> where all the values are True", and "OrderedSet" were "OrderedDict
>> where all the values are True"; combining sets is like combining
>> dictionaries, but you don't have to worry about merging the values.
>
>
> I think they already have most of the useful ones. Adding True values seems
> unnecessary, to me—that entries have no value seems more appropriate in
> terms of merging them making sense.

I don't know that *actually* having a True value for everything would
necessarily help, but in terms of defining operations like union and
intersection, it should be broadly equivalent to solving the same
problem with a dict/OrderedDict.

ChrisA