[Python-Dev] Pre-PEP: Exception Reorganization for Python 3.0

[M.-A. Lemburg]

Nick Coghlan wrote:
> I have a Python 2.5 candidate hierarchy below, which uses dual inheritance to 
> avoid breaking backward compatibility - any existing except clauses will catch 
> all of the exceptions they used to catch. The only new inheritance introduced 
> is to new exceptions, also avoiding backward compatibility problems, as any 
> existing except clauses will let by all of the exceptions they used to let by. 
> There are no removals, but the deprecation process is started in order to 
> change the names of ReferenceError and RuntimeWarning to WeakReferenceError 
> and SemanticsWarning.

+1.

I like this approach of using multiple inheritence to solve the
b/w compatibility problem.

-- 
Marc-Andre Lemburg
eGenix.com

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