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

Neil Girdhar mistersheik at gmail.com
Sun Feb 8 01:34:27 CET 2015

You make a good point, but I'm still unfortunately unconvinced. If it were called UniqueList, I would agree with you. Since it's called OrderedSet, I expect it to use the same operations as set. Also, typically I implement something using set and then after the fact realize that I need ordering. I then change the declaration to OrderedSet. With your solution, I would have to also change | and |= to + and +=. I feel that update should remain equivalent to |= rather than switching to +=,

Best,

Neil

On Sat, Feb 7, 2015 at 6:24 PM, Ed Kellett <edk141 at gmail.com> wrote:

On Sat Feb 07 2015 at 11:12:02 PM Neil Girdhar <mistersheik at gmail.com> wrote:

Why shouldn't that be the same as a | b | c | d ? I think it should and that in general union should be equivalent in effect to copy and extend. Because yielding an ordering doesn't have any basis in the definition of union, and it's not any easier to write than a + b + c + d. "copy and extend" is just concatenation - is there any reason not to use the concatenation operator for it, rather than the union? Ed Kellett -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-ideas/attachments/20150207/636a6234/attachment.html>

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