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Fragment of a discussion from User talk:Nx
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What's wrong with using an exception?

Python uses exceptions for error handling, and I think it's a more elegant way than having to check the return value against some arbitrary value that's defined as error and may be -1, 0, Null etc. depending on what the function is.

-- Nx / talk09:27, 27 December 2011

I meant that Blue should try to find some function in Python that just returned 404 or whatever if the link was broken, without raising an exception.

Mjollnir.svgListenerXTalkerX09:44, 27 December 2011