Re: how to add custom importer after the normal imports

Path	csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!bcyclone01.am1.xlned.com!bcyclone01.am1.xlned.com!newsfeed.xs4all.nl!newsfeed3.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path	<ian.g.kelly@gmail.com>
X-Original-To	python-list@python.org
Delivered-To	python-list@mail.python.org
X-Spam-Status	OK 0.105
X-Spam-Level	*
X-Spam-Evidence	'H': 0.79; 'S': 0.00; 'cpython': 0.05; 'before': 0.16; 'subject:after': 0.16; 'wrote:': 0.18; 'wed,': 0.18; 'implementing': 0.19; 'import': 0.22; 'install': 0.23; 'alternate': 0.24; 'earlier': 0.24; 'versions': 0.24; 'header:In- Reply-To:1': 0.27; 'am,': 0.29; 'message-id:@mail.gmail.com': 0.30; "skip:' 10": 0.31; 'allows': 0.31; 'this.': 0.32; 'subject:the': 0.34; 'could': 0.34; 'problem': 0.35; 'anybody': 0.35; 'received:google.com': 0.35; 'add': 0.35; 'entry': 0.36; 'hi,': 0.36; 'to:addr:python-list': 0.38; 'does': 0.39; 'to:addr:python.org': 0.39; 'how': 0.40; 'read': 0.60; 'first': 0.61; 'such': 0.63; 'default': 0.69; 'end.': 0.84; 'gelonida': 0.84; 'subject:add': 0.91
DKIM-Signature	v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; bh=L+A4XJvBaw7t9Xonnkt6ENFuok8pIdRU9eKWtenu81U=; b=F8EYHWLWn8cShFdsH5I8D2z+kDPVNgZ3tYPp2RZ5jKWX8PJY9hcVCF3JWaUAvFdNRE o8D/MD6w7ONAEpsviilpNrJbSqnVDNRVrHVX0GmLVE5v1jBwb+hMREA7rgsbuyuuDHiN 7IdXv9NCwLfSulw5bz7pw+aNEPEkYWg8SwIYRejMfxYr7x66+cAWbvkwS4U7nNw4Nhb8 KMzTXzBvVatPQufaDgShGfnRGrwaCAeqwXQasiStSN++wR8RdEL5JybujtlRssCUzrZA BnmXkeSV+xvSVwaxOkR6QNXdkv6EJbOFYYjOQfr2Yl3YJ1VqGi40A14ywTgVgvUowKu4 Lokw==
X-Received	by 10.50.22.101 with SMTP id c5mr1151398igf.29.1412808285376; Wed, 08 Oct 2014 15:44:45 -0700 (PDT)
MIME-Version	1.0
In-Reply-To	<m1353n$dpu$1@ger.gmane.org>
References	<m1353n$dpu$1@ger.gmane.org>
From	Ian Kelly <ian.g.kelly@gmail.com>
Date	Wed, 8 Oct 2014 16:44:04 -0600
Subject	Re: how to add custom importer after the normal imports
To	Python <python-list@python.org>
Content-Type	text/plain; charset=UTF-8
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.14697.1412808288.18130.python-list@python.org> (permalink)
Lines	20
NNTP-Posting-Host	2001:888:2000:d::a6
X-Trace	1412808288 news.xs4all.nl 2898 [2001:888:2000:d::a6]:48539
X-Complaints-To	abuse@xs4all.nl
X-Received-Bytes	3760
X-Received-Body-CRC	3367177782
Xref	csiph.com comp.lang.python:78860

Show key headers only | View raw

On Wed, Oct 8, 2014 at 4:53 AM, Gelonida N <gelonida@gmail.com> wrote:
> Hi,
>
>
> I just read about sys.meta_path, which allows to install custom importers
> *BEFORE* the default importers.
>
> However I have a use case where I would like to add a custom importer
> *AFTER* all other import methods have failed.
>
> Does anybody know how to do this.
>
> One way of implementing this would be to add the default importer as first
> entry in sys.meta_path. My only problem is, that I don't know how to create
> a 'default-importer', such that I can add it into sys.meta_path

As of CPython 3.3 the default importers are already in sys.meta_path,
so you could just add your custom importer to the end. If you need to
support earlier versions or alternate implementations then this may
not be reliable.

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

Thread

Re: how to add custom importer after the normal imports Ian Kelly <ian.g.kelly@gmail.com> - 2014-10-08 16:44 -0600

csiph-web