New submission from Jean-Paul Calderone:
$ ~/Projects/cpython/3.4/python -c '
class Foo(object):
def __ne__(self, other):
return "yup"
def __eq__(self, other):
return "nope"
class Bar(object):
pass
print(object() != Foo(), object() == Foo())
print(Bar() != Foo(), Bar() == Foo())
'
yup nope
False nope
$
The output I would expect from this is
yup nope
yup nope
That is, even when the type of the left-hand argument is not a base class of
the type of the right-hand argument, delegation to the right-hand argument is
sensible if the left-hand argument does not implement the comparison.
Note that the output also demonstrates that this is already the behavior for
`==`. Only `!=` seems to suffer from this issue.
----------
components: Interpreter Core
messages: 217699
nosy: exarkun
priority: normal
severity: normal
status: open
title: delegation of `!=` to the right-hand side argument is not always done
type: behavior
versions: Python 3.3, Python 3.4
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21408>
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