On Thu, Dec 2, 2021 at 1:33 AM André Roberge <andre.roberge@gmail.com> wrote:
On Wed, Dec 1, 2021 at 7:51 AM Chris Angelico <rosuav@gmail.com> wrote:
On Wed, Dec 1, 2021 at 10:30 PM André Roberge <andre.roberge@gmail.com> wrote:
2) Independently: Is the syntactic distinction between "=" and "=>" a cognitive burden?
Yes. I really think that using a keyword like defer, or from_calling_scope ;-), would significantly reduce the cognitive burden.
Also fair. I'm not a fan of keywords for this sort of thing, since it implies that you could do this:
def f(x=defer []): ...
dflt = defer [] def f(x=dflt): ...
which is a completely different proposal (eg it would be evaluated only when you "touch" that, rather than being guaranteed to be evaluated before the first line of the function body). That's why I want to adorn the equals sign and nothing else.
Shouldn't the PEP contain a rejected idea section where this could be mentioned?
Hmm, maybe. It's such a completely different proposal, but it does get asked a few times. If someone could actually put it forward as a full proposal, I'd gladly mention it as an interaction with another PEP. Otherwise, I'll write up a very brief thing on deferred expressions and how they're not what this is about. ChrisA