On 11/03/2014 08:12 AM, R. David Murray wrote:
On Mon, 03 Nov 2014 15:05:31 +0000, Brett Cannon <br...@python.org> wrote:
On Mon Nov 03 2014 at 5:31:21 AM Ethan Furman <et...@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).
I was wondering myself, which is why I started this thread.
--
~Ethan~
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