On Mon, Oct 25, 2021 at 7:51 PM Barry Scott <ba...@barrys-emacs.org> wrote:
>
> Clarification please:
>
> What is the bytecode that will be generated?
Equivalent to:
if argument not provided:
argument = <expr>
except that we don't have a way of saying "not provided".
> Does the bytecode only run the default code if the argument is missing?
Yes. It is for default values, not for transforming.
> And missing is not the same as is None?
Most assuredly not - that's part of the point. The semantics are
closer to the "dedicated sentinel" idiom, but there is no value which
can be passed which triggers this.
> Also have you add the @var=default suggestion from Stephen to the syntax
> options.
> I'm +1 on the @ syntax as it is easier to pick up on and the other reasons
> that Stephen
> provided.
Not really a fan, but I guess I can add it as an alternative.
ChrisA
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