[Python-Dev] PEP, take 2: Exception Reorganization for Python 3.0

[Guido van Rossum]

So here's a radical proposal (hear the scratching of the finglernail
on the blackboard? :-).

Start with Brett's latest proposal. Goal: keep bare "except:" but
change it to catch only the part of the hierarchy rooted at
StandardError.

- Call the root of the hierarchy Raisable.
- Rename CriticalException to CriticalError
  (this should happen anyway).
- Rename ControlFlowException to ControlFlowRaisable
  (anything except Error or Exception).
- Rename StandardError to Exception.
- Make Warning a subclass of Exception.

I'd want the latter point even if the rest of this idea is rejected;
when a Warning is raised (as opposed to just printing a message or
being suppressed altogether) it should be treated just like any other
normal exception, i.e. StandardError.

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