[Python-Dev] __subclasses__() return order

PJ Eby pje at telecommunity.com
Sat May 25 19:03:57 CEST 2013

On Sat, May 25, 2013 at 9:18 AM, Antoine Pitrou <solipsis at pitrou.net> wrote:
> In http://bugs.python.org/issue17936, I proposed making tp_subclasses
> (the internal container implementing object.__subclasses__) a dict.
> This would make the return order of __subclasses__ completely
> undefined, while it is right now slightly predictable. I have never seen
> __subclasses__ actually used in production code, so I'm wondering
> whether someone might be affected by such a change.

FWIW, when I've used __subclasses__, I've never depended on it having
a stable or predictable order.  (I find it somewhat difficult to
imagine *why* one would do that, but of course that doesn't mean
nobody has done it.)

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