[Python-Dev] The role of NotImplemented: What is it for and when should it be used? (original) (raw)
R. David Murray rdmurray at bitdance.com
Mon Nov 3 17:12:13 CET 2014
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On Mon, 03 Nov 2014 15:05:31 +0000, Brett Cannon <brett at python.org> wrote:
On Mon Nov 03 2014 at 5:31:21 AM Ethan Furman <ethan at stoneleaf.us> wrote:
> Just to be clear, this is about NotImplemented, not NotImplementedError. > > tl;dr When a binary operation fails, should an exception be raised or > NotImplemented returned? > The docs for NotImplemented suggest it's only for rich comparison methods and not all binary operators: https://docs.python.org/3/library/constants.html#NotImplemented . But then had I not read that I would have said all binary operator methods should return NotImplemented when the types are incompatible.
Ethan opened an issue and then changed those docs, but I now believe that the docs should be changed back (see the discussion in issue 22766).
--David
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