Multiple inheritence for exceptions?

[Steven D'Aprano]

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.

 

[Alex Martelli]

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.


Alex