Multiple inheritence for exceptions?

Alex Martelli aleax at
Mon Jun 4 02:35:06 CEST 2007

Steven D'Aprano <steve at> wrote:

> Useful or a bad idea?
> I have a module that defines a number of exceptions which inherit from
> various built-ins like KeyError, ValueError etc. I'm considering defining
> an abstract module exception like MyModuleError, and having all my real
> exceptions inherit from it as well, but I don't recall seeing that done
> before and I was wondering if it were a bad idea for some reason.

I often do exactly what you propose, and I believe I have suggested it
in the Nutshell 2nd edition.  I have never observed bad effects.


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