On Sep 4, 2012, at 11:32 AM, Eric Lemoine wrote:
> On Tue, Sep 4, 2012 at 5:30 PM, Michael Bayer <mike...@zzzcomputing.com>
> wrote:
>>
>> On Sep 4, 2012, at 11:24 AM, Eric Lemoine wrote:
>>
>>> On Tue, Sep 4, 2012 at 5:20 PM, Eric Lemoine
>>> <eric.lemo...@camptocamp.com> wrote:
>>>> On Tue, Sep 4, 2012 at 5:18 PM, Michael Bayer <mike...@zzzcomputing.com>
>>>> wrote:
>>>>> can't do __contains__ due to Python behavior:
>>>>>
>>>>> class Foo(object):
>>>>> def __add__(self, other):
>>>>> return (self, "add", other)
>>>>>
>>>>> def __contains__(self, other):
>>>>> return (self, "contains", other)
>>>>>
>>>>> f1 = Foo()
>>>>>
>>>>> assert f1 + 5 == (f1, "add", 5)
>>>>>
>>>>> assert 5 in f1 == (f1, "contains", 5), 5 in f1
>>>>>
>>>>> second assertion fails, it forces a bool() on the result. __nonzero__()
>>>>> is required to return True/False/int, I suppose we could make a custom
>>>>> int subclass but that's getting really weird.
>>>>
>>>>
>>>> Oh right. Thanks for the explanation.
>>>
>>>
>>>
>>> Actually, I was referring to "contains", not "__contains__".
>>
>> that should just work out of the gate. There's an "escape" kw you need to
>> ignore as it loops around, otherwise works:
>>
>> def test_contains(self):
>> class MyType(UserDefinedType):
>> class comparator_factory(UserDefinedType.Comparator):
>> def contains(self, other, **kw):
>> return self.op("->")(other)
>>
>> self.assert_compile(
>> Column('x', MyType()).contains(5),
>> "x -> :x_1"
>> )
>
> Ok I just didn't have **kw. I'm wondering if I should add it to all of
> my comparator functions.
well to the non-underscored names, it should be harmless. the underscored
names are Python API and won't change.
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