Re: Problems with subclassing enum34

Path	csiph.com!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.freenet.ag!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path	<ethan@stoneleaf.us>
X-Original-To	python-list@python.org
Delivered-To	python-list@mail.python.org
X-Spam-Status	OK 0.001
X-Spam-Evidence	'H': 1.00; 'S': 0.00; 'from:addr:ethan': 0.09; 'from:addr:stoneleaf.us': 0.09; 'from:name:ethan furman': 0.09; 'message-id:@stoneleaf.us': 0.09; 'received:184.172': 0.09; 'received:gator410.hostgator.com': 0.09; 'thus,': 0.09; '~ethan~': 0.09; 'bug': 0.12; '__new__': 0.16; 'bases,': 0.16; 'enum': 0.16; 'metaclass': 0.16; 'metaclasses': 0.16; 'received:gateway01.websitewelcome.com': 0.16; 'subject:Problems': 0.16; 'typeerror:': 0.16; 'fix': 0.17; 'wrote:': 0.18; 'solution.': 0.20; '>>>': 0.22; 'header:User-Agent:1': 0.23; 'error': 0.23; 'mention': 0.26; 'skip:" 40': 0.26; 'skip:_ 20': 0.27; 'gets': 0.27; 'header:In-Reply-To:1': 0.27; 'am,': 0.29; 'forgot': 0.30; 'robert': 0.30; "i'm": 0.30; 'work.': 0.31; 'that.': 0.31; 'ctypes': 0.31; 'file': 0.32; 'class': 0.32; '(most': 0.33; 'problem': 0.35; 'subject:with': 0.35; 'but': 0.35; 'there': 0.35; "didn't": 0.36; 'charset:us-ascii': 0.36; 'two': 0.37; 'to:addr:python-list': 0.38; 'skip:_ 40': 0.38; 'recent': 0.39; 'skip:_ 30': 0.39; 'sure': 0.39; 'to:addr:python.org': 0.39; 'how': 0.40; 'received:173': 0.61; 'simply': 0.61; 'chance': 0.65; 'thomas': 0.65; 'received:69.56': 0.68
Date	Fri, 28 Jun 2013 10:09:49 -0700
From	Ethan Furman <ethan@stoneleaf.us>
User-Agent	Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121010 Thunderbird/16.0.1
MIME-Version	1.0
To	python-list@python.org
Subject	Re: Problems with subclassing enum34
References	<b357q6Fql37U1@mid.individual.net> <mailman.3961.1372432574.3114.python-list@python.org> <b35o16Fu6l8U1@mid.individual.net> <b35odpFu8igU1@mid.individual.net>
In-Reply-To	<b35odpFu8igU1@mid.individual.net>
Content-Type	text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding	7bit
X-AntiAbuse	This header was added to track abuse, please include it with any abuse report
X-AntiAbuse	Primary Hostname - gator410.hostgator.com
X-AntiAbuse	Original Domain - python.org
X-AntiAbuse	Originator/Caller UID/GID - [47 12] / [47 12]
X-AntiAbuse	Sender Address Domain - stoneleaf.us
X-BWhitelist	no
X-Source
X-Source-Args
X-Source-Dir
X-Source-Sender	([173.12.184.233]) [173.12.184.233]:43919
X-Source-Auth	ethan+stoneleaf.us
X-Email-Count	1
X-Source-Cap	dG9idWs7dG9idWs7Z2F0b3I0MTAuaG9zdGdhdG9yLmNvbQ==
X-BeenThere	python-list@python.org
X-Mailman-Version	2.1.15
Precedence	list
List-Id	General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe	<http://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive	<http://mail.python.org/pipermail/python-list/>
List-Post	<mailto:python-list@python.org>
List-Help	<mailto:python-list-request@python.org?subject=help>
List-Subscribe	<http://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups	comp.lang.python
Message-ID	<mailman.3966.1372440712.3114.python-list@python.org> (permalink)
Lines	31
NNTP-Posting-Host	2001:888:2000:d::a6
X-Trace	1372440712 news.xs4all.nl 15964 [2001:888:2000:d::a6]:47663
X-Complaints-To	abuse@xs4all.nl
Xref	csiph.com comp.lang.python:49384

Show key headers only | View raw

On 06/28/2013 08:32 AM, Thomas Heller wrote:
> Am 28.06.2013 17:25, schrieb Thomas Heller:
>> Robert Kern:
>>
>>>
>>> enum.EnumMeta uses super() in its __new__() implementation but
>>> _ctypes.PyCSimpleType doesn't. Thus, only
>>> _ctypes.PyCSimpleType.__new__() gets a chance to run. Switching the
>>> order of the two might work.
>>>
>>
>> Robert found the problem but I'm unsure if there is a solution.
>> Also I'm unsure whether this is a bug in ctypes or in enum or if
>> they are simply incompatible.
>
> I forgot to mention that switching the order of metaclasses didn't work.

Here's the traceback:

Traceback (most recent call last):
   File "ct.py", line 7, in <module>
     class MyEnum(ctypes.c_int, Enum):
   File "/home/ethan/source/enum/enum/py2_enum.py", line 149, in __new__
     enum_class = super(EnumMeta, metacls).__new__(metacls, cls, bases, classdict)
TypeError: Error when calling the metaclass bases
     _ctypes.PyCSimpleType.__new__(MyEnum_meta) is not safe, use type.__new__()

Not sure how to fix that.

--
~Ethan~

Back to comp.lang.python | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Problems with subclassing enum34 Thomas Heller <theller@ctypes.org> - 2013-06-28 12:48 +0200
  Re: Problems with subclassing enum34 Robert Kern <robert.kern@gmail.com> - 2013-06-28 12:16 +0100
  Re: Problems with subclassing enum34 88888 Dihedral <dihedral88888@gmail.com> - 2013-06-28 04:52 -0700
  Re: Problems with subclassing enum34 Ethan Furman <ethan@stoneleaf.us> - 2013-06-28 08:16 -0700
    Re: Problems with subclassing enum34 Thomas Heller <theller@ctypes.org> - 2013-06-28 17:25 +0200
      Re: Problems with subclassing enum34 Thomas Heller <theller@ctypes.org> - 2013-06-28 17:32 +0200
        Re: Problems with subclassing enum34 Robert Kern <robert.kern@gmail.com> - 2013-06-28 17:17 +0100
        Re: Problems with subclassing enum34 Ethan Furman <ethan@stoneleaf.us> - 2013-06-28 10:09 -0700

csiph-web