Steven D'Aprano <[email protected]> added the comment:
> the canonical __ne__ delegation to __eq__ for any class should be implemented
> as something like
I disagree that your code snippet is the canonical way to write __ne__. I'd
write it like this:
def __ne__(self, other):
return not (self == other)
Or just not write it at all. Python will automatically call __eq__ going back
to Python 2.4 (and possibly older).
Delegating to __eq__ directly is the wrong way to do it.
> NotImplemented is a sentinel value that should never be evaluated in a
> boolean context
I don't see why not. I can't think of any use-cases where I would want to
*specifically* use NotImplemented in a boolean context, but I see no good
reason why I would want it to fail if one happened to do so.
----------
nosy: +steven.daprano
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<https://bugs.python.org/issue35712>
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