On 12Apr2015 16:33, Cameron Simpson <c...@zip.com.au> wrote:
Finally, if we were to expunge support for "except:", one would also need a
cast iron guarrentee that no exception could possibly occur which was not a
subclass of BaseException. I'd expect that to mean that "raise" of a
non-instance of BaseException to itself raise a TypeError.
And I see that Steven D'Aprano has already pointed out PEP 352:
http://www.python.org/dev/peps/pep-0352/
which is marked "Status: Final". It says:
The raise statement will be changed to require that any object passed to it
must inherit from BaseException. This will make sure that all exceptions fall
within a single hierarchy that is anchored at BaseException [2] . This also
guarantees a basic interface that is inherited from BaseException. The change
to raise will be enforced starting in Python 3.0 (see the Transition Plan
below).
Hmm. Not in 2.7? I can see the breakage it could cause, but where does that
leave me? I think I could probably move to catching Exception almost across the
board even in 2.5+ and feel pretty good.
Cheers,
Cameron Simpson <c...@zip.com.au>
If your new theorem can be stated with great simplicity, then there
will exist a pathological exception. - Adrian Mathesis
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