Brett Cannon <br...@python.org> added the comment: On Mon, Sep 7, 2009 at 13:01, Jean-Paul Calderone<rep...@bugs.python.org> wrote: > > Jean-Paul Calderone <exar...@divmod.com> added the comment: > > Hm. That PEP is marked as rejected, though. I guess it was partially > implemented, those changes included in the Python 2.5 release, and then > it was decided that it was a bad idea, rejected, and the changes undone > for 3.x (what about 2.7)? Or did something else happen? >
I screwed up and pasted in the URL for the wrong PEP. Sorry about that. Written a few too many PEPs involving exceptions. The correct one is http://www.python.org/dev/peps/pep-0352/ . > I did a simple search on the PEP for the word "message", but the word > doesn't appear anywhere in the text! So I guess it's a feature that's > implied by the PEP, but I would appreciate some help figuring out the > implication. > > Here's what I do see: > > - If one argument is passed to BaseException.__init__, then the value > is used as the value for the message attribute. > - If zero or more than one arguments are passed, then the attribute is > given the empty string for a value. > - If zero or one arguments are passed, the message attribute is used > as the string representation of the exception instance. > > The deprecation warning emitted in 2.6 doesn't tell me which of these > things is deprecated, though. Is there something more to the message > attribute, or are one or more of the above list things which should no > longer be relied on? The 'message' attribute itself is deprecated as it didn't exist prior to being introduced in 2.5. The original idea was to not let BaseException take multiple arguments to its constructor and have message be what replaced 'args'. But when I tried to do that at PyCon 2007 the pain was too great so it was decided a more long-term strategy to making BaseException accept a single argument was needed. So the 'message' attribute that got added to BaseException was retracted. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue6844> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
