Would this feature allow me to declare str objects as not iterable in some contexts?
If so, +1. On Thu, Jun 24, 2021, 3:22 PM Chris Angelico <ros...@gmail.com> wrote: > On Fri, Jun 25, 2021 at 3:31 AM Steven D'Aprano <st...@pearwood.info> > wrote: > > > > Here's a quick and dirty proof of concept I knocked up in about 20 > > minutes, demonstrating that no deep compiler magic is needed. It's just > > a small change to the way `object.__getattribute__` works. > > > > I've emulated it with my own base class, since `object` can't be > > monkey-patched. > > > > The proof of concept is probably buggy and incomplete. It isn't intended > > to be a final, polished production-ready implementation. It's not > > implementation-agnostic: it requires the ability to inspect the call > > stack. If you're using IronPython, this may not work. > > > > You will notice I didn't need to touch getattr to have it work, let > > alone hack the interpreter to make it some sort of magical construct. It > > all works through `__getattribute__`. > > > > The registration system is just the easiest thing that I could throw > > together. There are surely better designs. > > > > Run A.py to see it in action. > > > > Okay, so you've hidden the magic away a bit, but you have to choose > the number [2] for your stack inspection. That means you have to be > sure that that's the correct module, in some way. If you do *anything* > to disrupt the exact depth of the call stack, that breaks. > > _hasattr = hasattr > def hasattr(obj, attr): return _hasattr(obj, attr) > > Or any of the other higher level constructs. What if there's a C-level > function in there? > > This is still magic. It's just that the magic has been buried slightly. > > 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/RPBIHJE3SHL7S6XIS2343SXCOTW5C54A/ > Code of Conduct: http://python.org/psf/codeofconduct/ >
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