Method to know if object support being weakreferenced ?
steve+comp.lang.python at pearwood.info
Tue Dec 13 01:00:02 EST 2016
On Tuesday 13 December 2016 15:57, Matthias Bussonnier wrote:
> I could of course write a function that try/except and return False/True
> depending on the result, but that seem suboptimal as how can I know that the
> TypeError does come from not being able to take a weak reference ? And not
> from something else ?
Do you mean something like this?
proxy = weakref.proxy(obj)
proxy = None
Where else could it come from?
> The common Idiom in CPython, at the C layer seem to be
> PyType_SUPPORTS_WEAKREFS(Py_TYPE(ob)). So I can (and did) write a C-extension
> that expose such a function, but it does seem silly that no one else did that
> before me, and that no one seemed to have encountered the problem before.
> So am I missing something ? Is such a function not useful ? Is there any
> reason not to have it in the stdlib ?
You could try raising a feature request on the bug tracker.
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." - Jon Ronson
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