[Python-Dev] __getslice__ usage in sre_parse

Dino Viehland dinov at exchange.microsoft.com
Mon May 1 17:31:40 CEST 2006

I've also opened a bug for supporting __getslice__ in IronPython.

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-----Original Message-----
From: python-dev-bounces+dinov=microsoft.com at python.org [mailto:python-dev-bounces+dinov=microsoft.com at python.org] On Behalf Of Guido van Rossum
Sent: Sunday, April 30, 2006 8:31 AM
To: Sanghyeon Seo
Cc: Discussion of IronPython; python-dev at python.org
Subject: Re: [Python-Dev] __getslice__ usage in sre_parse

On 4/28/06, Sanghyeon Seo <sanxiyn at gmail.com> wrote:
> Hello,
> Python language reference 3.3.6 deprecates __getslice__. I think it's
> okay that UserList.py has it, but sre_parse shouldn't use it, no?

Well, as long as the deprecated code isn't removed, there's no reason
why other library code shouldn't use it. So I disagree that
technically there's a reason why sre_parse shouldn't use it.

> __getslice__ is not implemented in IronPython and this breaks usage of
> _sre.py, a pure-Python implementation of _sre, on IronPython:
> http://ubique.ch/code/_sre/
> _sre.py is needed for me because IronPython's own regex implementation
> using underlying .NET implementation is not compatible enough for my
> applications. I will write a separate bug report for this.
> It should be a matter of removing __getslice__ and adding
> isinstance(index, slice) check in __getitem__. I would very much
> appreciate it if this is fixed before Python 2.5.

You can influence the fix yourself -- please write a patch (relative
to Python 2.5a2 that was just released), submit it to Python's patch
tracker on SourceForge (read python.org/dev first), and then sending
an email here to alert the developers. This ought to be done well
before the planned 2.5b1 release (see PEP 256 for the 2.5 release
timeline). You should make sure that the patched Python 2.5 passes all
unit tests before submitting your test.

Good luck!

--Guido van Rossum (home page: http://www.python.org/~guido/)
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