Coding Style: exiting python programs
On Wed, 2012-09-26 at 22:06 +1000, Amit Saha wrote:
> On Wed, Sep 26, 2012 at 1:04 AM, Will Woods <firstname.lastname@example.org> wrote:
> > Hey all - here is a quick note about the various ways to exit python
> > programs. Consider this a suggestion for a future CodingStyle / New
> > Developer FAQ, or something.
> > sys.exit(returncode) really just does:
> > raise SystemExit(returncode)
> > So we can use that rather than importing sys just for sys.exit().
> > Note that SystemExit is a subclass of Exception, so if you're handling
> > Exception anywhere, you're going to catch SystemExit/sys.exit().
> > (This is another reason 'except Exception: ..." is a bad idea.)
> Thanks for the tip. Perhaps you should add that SystemExit is a
> subclass of BaseException and not Exception starting Python 2.5 .
Right. This is why we went from a bare 'except' to 'except Exception' in
much of anaconda a couple of years ago -- to not catch SystemExit.
>  http://docs.python.org/library/exceptions.html#exceptions.SystemExit
> (Thanks to Nick Coghlan for pointing this to me when i shared your tip
> on twitter).
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