Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!aioe.org!feeder.news-service.com!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Date: Tue, 21 Jun 2011 20:04:43 +1000
From: Cameron Simpson <cs@zip.com.au>
To: Steven D'Aprano <steve+comp.lang.python@pearwood.info>
Subject: Re: break in a module
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <4dfc2084$0$30002$c3e8da3$5496439d@news.astraweb.com>
User-Agent: Mutt/1.5.20 (2009-06-14)
References: <4dfc2084$0$30002$c3e8da3$5496439d@news.astraweb.com>
Cc: python-list@python.org
Precedence: list
Newsgroups: comp.lang.python
Message-ID: <mailman.221.1308650694.1164.python-list@python.org>
Lines: 50
NNTP-Posting-Host: 82.94.164.166
Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:8081

On 18Jun2011 03:50, Steven D'Aprano <steve+comp.lang.python@pearwood.info> wrote:
| On Sat, 18 Jun 2011 12:36:42 +1000, Cameron Simpson wrote:
| > Just to throw another approach into the mix (because I was thinking
| > about the "finally" word), what about:
| > 
| >   raise StopImport
| > 
| > along the lines of generators' "raise StopIteration".
| > 
| > Then the import machinery can catch it, no new keyword is needed and no
| > existing keyword needs feature creeping.
| 
| The only problem is that the importing module needs to catch it, or else 
| you get a traceback. The importer shouldn't need to care what goes in 
| inside the module.

I was thinking the import mechanism itself would catch it, not the user
of the "import" statement. Just as this:

  for i in iterator:
    ...

quietly ceases the loop when the iterator raises StopIteration, the
importer would consider a module that raised StopImport during the import
to have finished its import successfully.

So the caller does an:

  import foo

as normal, with no special wrapping. And the module goes:

  spam()
  if condition:
    raise StopIteration
  ham()
  cheese()

Cheers,
-- 
Cameron Simpson <cs@zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

In article <323C4DB9.6A76@ss1.csd.sc.edu>, lhartley@ss1.csd.sc.edu wrote:
| It still is true that the best touring bike is the one that you are
| riding right now.  Anything can be used for touring.  As long as you
| can travel, you are touring.
I beleive such true and profound statements are NOT allowed to be posted
in this newsgroup, and are also against the charter.  You've been warned.
        - Randy Davis DoD #0013 <randy@agames.com> in rec.moto