Re: multiprocessing.Queue() and missing sem_open

Path	csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed2.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path	<rosuav@gmail.com>
X-Original-To	python-list@python.org
Delivered-To	python-list@mail.python.org
X-Spam-Status	OK 0.010
X-Spam-Evidence	'H': 0.98; 'S': 0.00; 'attribute': 0.07; 'subject:missing': 0.07; 'lookup': 0.09; 'try:': 0.09; 'will,': 0.09; 'cc:addr:python-list': 0.11; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'reasonably': 0.16; 'say.': 0.16; 'wrote:': 0.18; 'feb': 0.22; 'import': 0.22; 'cc:addr:python.org': 0.22; 'cc:2**0': 0.24; 'header:In-Reply- To:1': 0.27; 'correct': 0.29; 'on,': 0.29; 'message- id:@mail.gmail.com': 0.30; 'code': 0.31; 'bad.': 0.31; 'fri,': 0.33; 'actual': 0.34; 'maybe': 0.34; "can't": 0.35; 'except': 0.35; 'something': 0.35; 'test': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'skip:\xd0 10': 0.36; 'handle': 0.38; 'pm,': 0.38; "couldn't": 0.39; 'sure': 0.39; 'future': 0.60; 'more': 0.64; '2015': 0.84; 'to:none': 0.92
DKIM-Signature	v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:cc :content-type:content-transfer-encoding; bh=8ymk6rIZwP5gtC8JgSd7MFQ62fS2sn7ZiJSn9c4ZyeA=; b=H/wp++KMcavSWuZN5KwHrqoLh9aTedfSJWuQNAVQu6dO6iBNpHSZccA6VhZ9XDMcnJ ZKyqfw6M3o5BM/ss4ScQ3ZADOVGYkPpv7sk8fkWhaIn6Q8z7dJmfCpW6AOs8uwSgvKnr OL/m8YUNh0E1FDO++stcpiDky4DoqSsnnhqHXXWpKExqxg3/mAw55GZI4vXopXcQIQmq XsRUDFT+j3n9FBjPLvIv6yYb9m5vFLYVsJomcfRolPFl+ymPNu6ssZqoJExIzBbUe3Ij 7vGgIfeRLz7AdHW0kZzg6d8CMhSSVVpIl8VQkmGOkYPpqPNTX8HipzVHtDonDWXpVxOr CWyg==
MIME-Version	1.0
X-Received	by 10.42.95.12 with SMTP id d12mr11577759icn.12.1423211648056; Fri, 06 Feb 2015 00:34:08 -0800 (PST)
In-Reply-To	<ytz8ugbo36u.fsf@news.ole.ath.cx>
References	<877fvwaz1y.fsf@news.ole.ath.cx> <mailman.18497.1423175353.18130.python-list@python.org> <ytz8ugbo36u.fsf@news.ole.ath.cx>
Date	Fri, 6 Feb 2015 19:34:08 +1100
Subject	Re: multiprocessing.Queue() and missing sem_open
From	Chris Angelico <rosuav@gmail.com>
Cc	"python-list@python.org" <python-list@python.org>
Content-Type	text/plain; charset=UTF-8
Content-Transfer-Encoding	quoted-printable
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	<https://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	<https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups	comp.lang.python
Message-ID	<mailman.18504.1423211656.18130.python-list@python.org> (permalink)
Lines	24
NNTP-Posting-Host	2001:888:2000:d::a6
X-Trace	1423211656 news.xs4all.nl 2830 [2001:888:2000:d::a6]:43461
X-Complaints-To	abuse@xs4all.nl
Xref	csiph.com comp.lang.python:85283

Show key headers only | View raw

On Fri, Feb 6, 2015 at 7:27 PM, Оlе Ѕtrеісhеr <ole-usenet-spam@gmx.net> wrote:
>> the AttributeError will come from the attribute lookup - the above code
>> can't[1] bomb out with ImportError.
>
> Maybe it can't but it actually does.

Huh. Okay, my bad. (I don't have a Hurd system to test on, all my
Debians are Linux.) Sorry for the misinformation.

>> So a more correct way would be something like:
>>
>> try:
>>     import multiprocessing
>>     multiprocessing.Queue
>> except (ImportError, AttributeError):
>>     # handle the absence
>
> Is it sure that this will work in the future as well?

Frankly, I don't know now. It's reasonably likely that it will, but in
the absence of actual documentation, I couldn't say.

ChrisA

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

Thread

multiprocessing.Queue() and missing sem_open ole-usenet-spam@gmx.net (Оlе Ѕtrеісhеr) - 2015-02-05 21:22 +0100
  Re: multiprocessing.Queue() and missing sem_open Chris Angelico <rosuav@gmail.com> - 2015-02-06 09:29 +1100
    Re: multiprocessing.Queue() and missing sem_open ole-usenet-spam@gmx.net (Оlе Ѕtrеісhеr) - 2015-02-06 09:27 +0100
      Re: multiprocessing.Queue() and missing sem_open Chris Angelico <rosuav@gmail.com> - 2015-02-06 19:34 +1100

csiph-web