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From: Chris Angelico <rosuav@gmail.com>
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Subject: Re: REMOVE ME
Date: Tue, 12 Apr 2016 10:44:59 +1000
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Xref: csiph.com comp.lang.python:106897

On Tue, Apr 12, 2016 at 9:10 AM, Steven D'Aprano <steve@pearwood.info> wrote:
> Hence "self.things" will return the same
> list each time, the one defined as a class attribute, regardless of
> which "self" does the lookup.
>
> If a method were to assign to the attribute, for example "self.things = []",
> that would create an instance attribute, but that doesn't happen.

Indeed. And the __del__ method is guaranteed always to raise an
exception; by the time __del__ gets called, there can't be any
references to the object anywhere, so it can't be in that list any
more...

ChrisA