From: Jim Lee <jle...@gmail.com>
On 06/23/2018 11:02 PM, Chris Angelico wrote: > On Sun, Jun 24, 2018 at 3:44 PM, Jim Lee <jle...@gmail.com> wrote: >> >> On 06/23/2018 10:03 PM, Steven D'Aprano wrote: >>> I'd like to run a quick survey. There is no right or wrong answer, since >>> this is about your EXPECTATIONS, not what Python actually does. >>> >>> Given this function: >>> >>> >>> def test(): >>> a = 1 >>> b = 2 >>> result = [value for key, value in locals().items()] >>> return result >>> >>> >>> >>> >>> what would you expect the result of calling test() to be? Is that the >>> result you think is most useful? In your opinion, is this a useful >>> feature, a misfeature, a bug, or "whatever"? >>> >>> I'm only looking for answers for Python 3. (The results in Python 2 are >>> genuinely weird :-) >>> >>> >> I would *expect* [1, 2, None], though I haven't actually tried running it. >> > Interesting. Where do you get the None from? Suppose it had been "key > for..." instead of "value", what would the third key have been? ["a", > "b", ...] > > ChrisA There are three locals:Γ a, b, and result.Γ Since result cannot be assigned a value until the list comp has been evaluated, I would expect the comp to return a value of "None" for result.Γ An argument could also be made for [1, 2, []], but one thing I would *not* expect is [1, 2] or [2, 1]... -Jim --- BBBS/Li6 v4.10 Toy-3 * Origin: Prism bbs (1:261/38) -- https://mail.python.org/mailman/listinfo/python-list
