On 03/20, Nathaniel Smith wrote:
>
> Modern CPython, and all extant versions of PyPy and Jython, guarantee that
> __del__ is called at most once. MicroPython doesn't support user-defined
> __del__ methods.
>
> It's fine if the text wants to leave that open, but the current phrasing is
> pretty misleading IMO. I also read it as saying that __del__ would be
> called again if the object is collected again (which may or may not
> happen).
Yes, that is why I was confused. Just I could not believe nobody else noticed
this "bug" so I decided to check the sources and yes, the code looks very clear.
> But AFAICT there are actually zero implementations where this is
> true.
Probably this was mostly true until the commit 796564c2 ("Issue #18112: PEP
442 implementation (safe object finalization)."), python2 calls __del__ again.
> Probably worth a small edit :-)
Agreed. And it seems that not only me was confused,
http://doc.pypy.org/en/latest/cpython_differences.html says:
There are a few extra implications from the difference in the GC. Most
notably, if an object has a __del__, the __del__ is never called more
than once in PyPy; but CPython will call the same __del__ several times
if the object is resurrected and dies again.
Thanks to all!
Oleg.
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