Proposed new syntax
Matt Wheeler
m at funkyhat.org
Thu Aug 10 12:54:59 EDT 2017
On Thu, 10 Aug 2017 at 15:28 Steve D'Aprano <steve+python at pearwood.info>
wrote:
> Every few years, the following syntax comes up for discussion, with some
> people
> saying it isn't obvious what it would do, and others disagreeing and saying
> that it is obvious. So I thought I'd do an informal survey.
>
> What would you expect this syntax to return?
>
Without reading the rest of the thread so far :)...
> [x + 1 for x in (0, 1, 2, 999, 3, 4) while x < 5]
>
[1, 2, 3]
> For comparison, what would you expect this to return? (Without actually
> trying
> it, thank you.)
>
> [x + 1 for x in (0, 1, 2, 999, 3, 4) if x < 5]
>
[1, 2, 3, 4, 5]
> How about these?
>
> [x + y for x in (0, 1, 2, 999, 3, 4) while x < 5 for y in (100, 200)]
>
[100, 200, 101, 201, 102, 202]
> [x + y for x in (0, 1, 2, 999, 3, 4) if x < 5 for y in (100, 200)]
[100, 200, 101, 201, 102, 202, 103, 203, 104, 204]
--
--
Matt Wheeler
http://funkyh.at
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