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Nick Coghlan firstname.lastname@example.org wrote:
Rather than trying to change course midstream, I like the fact that the PEP 352 hierarchy introduces BaseException to bring the language itself into line with what people have already been taught. Breaking things in Py3k is all well and good, but breaking them gratuitously is something else entirely :)
I really like this too, but Barry's proposal doesn't really break anything. Existing Python code that creates a FooBar(Exception) and then catches it with either "except FooBar:" or "except Exception, e:" + check for FooBar, will still work as expected. At worse, it would be catching too much, like SystemExit or GeneratorExit, which are still pretty uncommon exception.
OTOH, I also understand that people have been told that deriving from Exception is the right thing to do forever now.