[Python-Dev] __subclasses__() return order

Eli Bendersky eliben at gmail.com
Sat May 25 15:23:56 CEST 2013

On Sat, May 25, 2013 at 6:18 AM, Antoine Pitrou <solipsis at pitrou.net> wrote:

> Hello,
> 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.
> Regards

Personally I never used it, but it's now explicitly documented as returning
a list. Not sure what's the right thing to do here, but perhaps returning
an OrderedDict can eliminate the order problem?

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