[Python-Dev] Exceptions and slicing
brett at python.org
Wed Sep 20 22:04:49 CEST 2006
On 9/20/06, Thomas Heller <theller at python.net> wrote:
> Brett Cannon schrieb:
> > On 9/20/06, Thomas Heller <theller at python.net> wrote:
> >> Is it an oversight that exception instances do no longer support
> >> slicing in Python 2.5?
> >> This code works in 2.4, but no longer in 2.5:
> >> try:
> >> open("", "r")
> >> except IOError, details:
> >> print details[:]
> > Technically, yes. There is no entry in the sq_slice field for the
> > PySequenceMethods struct. Although you can get to the list of arguments
> > going through the 'args' attribute if you need a quick fix.
> Well, Nick Coghlan pointed out in private email:
> >> According to PEP 352 it should have at most been deprecated along with
> >> rest of Exception.__getitem__:
> >> "This also means providing a __getitem__ method is unneeded for
> exceptions and
> >> thus will be deprecated as well."
Right, the deprecation is not scheduled until Python 2.9 for __getitem__ so
it was a regression problem (was never a test for it before PEP 352 was
written). The fix is now in so your code should work again from a trunk
checkout. I will backport when the freeze is raised.
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