On Tue, Oct 26, 2021 at 1:10 PM David Mertz, Ph.D.
<david.me...@gmail.com> wrote:
>
> I like this. I think explicitly discussing order of inclusion would be
> worthwhile. I know it's implied by the approximate equivalents, but actually
> stating it would improve the PEP, IMO.
>
> For example:
>
> nums = [(1, 2, 3), (1.0, 2.0, 3.0)]
> nset = {*n for n in nums}
>
> Does 'nset' wind up containing integers or floats? Is this a language
> guarantee?
>
Easy way to find out: take out the extra nesting level and try it.
>>> nums = [1, 2, 3, 1.0, 2.0, 3.0]
>>> nset = {n for n in nums}
>>> nset
{1, 2, 3}
The *n version would have the exact same behaviour, since it will see
the elements in the exact same order.
ChrisA
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