2013/4/27 Nick Coghlan <ncogh...@gmail.com>: > On Sun, Apr 28, 2013 at 11:38 AM, Benjamin Peterson <benja...@python.org> > wrote: >> 2013/4/27 Nick Coghlan <ncogh...@gmail.com>: >>> >>> On 28 Apr 2013 04:30, "Ethan Furman" <et...@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. >> >> That's not the problem. You can't inject names dynamically into a >> function scope with variables in a class scope, since nothing closes >> over them. > > Yeah, what I wrote didn't quite capture what I meant: > > - in Python 2.x, using LOAD_DEREF when a nested class body references > a lexically scoped name is correct > - in Python 3.x, it is no longer correct, because __prepare__ may > inject additional names that the compiler doesn't know about
You could still get the same "bug" in Python 2 by messing with locals() in a class within a function. -- Regards, Benjamin _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
