[Python-Dev] class name spaces inside an outer function

Nick Coghlan ncoghlan at gmail.com
Sun Apr 28 03:26:28 CEST 2013

On 28 Apr 2013 04:30, "Ethan Furman" <ethan at stoneleaf.us> wrote:
> I filed bug http://bugs.python.org/issue17853 last night.
> If somebody could point me in the right direction (mainly which files to
look in), I'd be happy to attempt a patch.

Hmm, interesting challenge. A key part of the problem is that the 3.x
compiler assumes there's no way to inject names it doesn't know about into
code inside a function - we missed the fact that you could still do it with
a nested class and a metaclass __prepare__ method.

I suspect resolving it sensibly will require a new opcode that tries a
local-only load and then falls back to loading from a cell rather than from
a global/builtins lookup.


> --
> ~Ethan~
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