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2011年12月28日 João Bernardo <report@bugs.python.org>:
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> João Bernardo <jbvsmo@gmail.com> added the comment:
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> I see that every other comparison operator (<, >, <=, >=, ==, !=) except for `is` work the way I expect and is able to return anything.
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> e.g.
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>>>> numpy.arange(5) < 3
> array([ True, True, True, False, False], dtype=bool)
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> I didn't checked the code (and probably I'm talking nonsense), but seems like the `in` operator has an extra call to `PyObject_IsTrue` that maybe could be dropped?
I'm not sure what you're referring to, but I doubt that would do the job.
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> Of course it can break code relying on `x in y` being True/False but it would only happen on customized classes.
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> Another option that won't break code is to add a different method to handle these cases. Something like "__contains_non_bool__", but that'd be a big api change.
And completely hideous.