On Thu, 23 Jun 2022 at 11:35, Joao S. O. Bueno <jsbu...@python.org.br> wrote:
>
> Martin Di Paola wrote:
> > Three cases: Dask/PySpark, Django's ORM and selectq. All of them
> > implement deferred expressions but all of them "compute" them in very
> > specific ways (aka, they plan and execute the computation differently).
>
>
> So - I've been hit with the "transparency execution of deferred code" dilemma
> before.
>
> What happens is that: Python, at one point will have to "use" an object - and
> that use
> is through calling one of the dunder methods. Up to that time, like, just
> writing the object name
> in a no-operation line, does nothing. (unless the line is in a REPL, which
> will then call the __repr__
> method in the object).
Why are dunder methods special? Does being passed to some other
function also do nothing? What about a non-dunder attribute?
Especially, does being involved in an 'is' check count as using an object?
dflt = fetch_cached_object("default")
mine = later fetch_cached_object(user.keyword)
...
if mine is dflt: ... # "using" mine? Or not?
Does it make a difference whether the object has previously been poked
in some other way?
ChrisA
_______________________________________________
Python-ideas mailing list -- python-ideas@python.org
To unsubscribe send an email to python-ideas-le...@python.org
https://mail.python.org/mailman3/lists/python-ideas.python.org/
Message archived at
https://mail.python.org/archives/list/python-ideas@python.org/message/HUJ36AA34SZU7D5Q4G6N5UFFKYUOGOFT/
Code of Conduct: http://python.org/psf/codeofconduct/
