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Sun Apr 28 03:07:49 CEST 2013 · https://mail.python.org/pipermail/python-dev/2013-April/125652.html

On Sat, Apr 27, 2013 at 2:27 PM, 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.

Wow.  I had no idea Python actually did this (override class-local
references with ; I'd have expected your code to work.  I was even
more surprised to find that the same thing happens all the way back to
Python 2.3.  Guess I'm not nearly the wizard of abusing scope rules
that I thought I was.  ;-)

About the only workaround I can see is to put "Season = Season" at the
top of a class that uses this inside a function definition, or else to
define a special name 'enum' instead and hope that nobody ever tries
to define an enumeration inside a function with a local variable named
'enum'.  ;-)

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