-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Brett Cannon wrote: > During the PyCon sprint I tried to make BaseException accept only a single > argument and bind it to BaseException.message . I was successful (see the > p3yk_no_args_on_exc branch), but it was very painful to pull off as anyone > who sat around me the last three days of the sprint will tell you as they > had to listen to me curse incessantly. > > Because of the pain that I went through in the transition and thus the > lessons learned, Guido and I discussed it and we think it would be best to > give up on forcing BaseException to accept only a single argument. I think > it is still doable, but requires a multi-release transition period and not > the one that 2.6 -> 3.0 is offering. And so Guido and I plan on deprecating > BaseException.message as its entire point in existence was to help > transition to what we are not going to have happen. =) > > Now that means BaseException.message might hold the record for shortest > lived feature as it was only introduced in 2.5 and is now to be deprecated > in 2.6 and removed in 2.7/3.0. =) > > Below is PEP 352, revised to reflect the removal of > BaseException.messageand for letting the 'args' attribute stay (along > with suggesting one should > only pass a single argument to BaseException). Basically the interface for > exceptions doesn't really change in 3.0 except for the removal of > __getitem__.
Hmm, I'm working on cleaning up deprecations for Zope and related packages under Python 2.6. The irony here is that I'm receiving deprecation warnings for custom exception classes which had a 'message' attribute long before the abortive attempt to add them to the BaseException type, which hardly seems reasonable. For instance, docutils.parsers.rst defines a DirectiveError which takes two arguments, 'level' and 'message', and therefore gets hit with the deprecation (even though it never used the new signature). Likewise, ZODB.POSException defines a ConflictError type which takes 'message' as one of several arguments, all optional, and has since at least 2002. I don't think either of these classes should be subject to a deprecation warning for a feature they never used or depended on. Tres. - -- =================================================================== Tres Seaver +1 540-429-0999 tsea...@palladion.com Palladion Software "Excellence by Design" http://palladion.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFJ2iqv+gerLs4ltQ4RArg7AJ9cjTweXUuGdUZNxZ3dHzYb9u6AcQCePJW/ PrXQ48wFrwrsrXSslZ0LSB4= =VU1d -----END PGP SIGNATURE----- _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
