[Python-Dev] exception chaining (original) (raw)

Benjamin Peterson benjamin at python.org
Fri Jan 20 18:47:13 CET 2012

2012/1/20 Ethan Furman <ethan at stoneleaf.us>:

Summary:

Exception Chaining is cool, unless you are writing libraries that want to transform from Exception X to Exception Y as the the previous exception context is unnecessary, potentially confusing, and cluttery (yup, just made that word up!). For all the gory details, see http://bugs.python.org/issue6210. I'm going to attempt a patch implementing MRAB's suggestion: try:  someop except ValueError:  raise as OtherError() # raise keeps context, raise as does not

I dislike this syntax. Raise what as OtherError()? I think the "raise x from None" idea is preferable, since it indicates you are nulling the context. The optimal solution would be to have "raise X nocontext", but that would obviously require another keyword...

-- Regards, Benjamin

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