On Apr 14, 2010, at 10:55 PM, Stefan Behnel wrote:
> Robert Bradshaw, 15.04.2010 01:39:
>> On Apr 14, 2010, at 4:31 PM, Lisandro Dalcin wrote:
>>
>>> On 14 April 2010 19:38, Greg Ewing wrote:
>>>> Stefan Behnel wrote:
>>>>
>>>>> Should builtins continue to accept None or should it behave like
>>>>> other
>>>>> extension types?
>>>>
>>>> Pyrex treats them just like any other extension type. In
>>>> fact the *are* just extension types that happen to be
>>>> predeclared.
>>
>> In Cython, builtin types are a bit special as it checks to make sure
>> it is exactly the specified type, not just a subclass. (Otherwise,
>> there's little room for optimization and so little point in declaring
>> them.)
>>
>>> I agree with Greg and Stefan, i.e., no special handling for builtin
>>> types.
>>
>> Yes, lets not an an exception to the exception...
>
> Ok, so it looks like we agree that this should raise an exception:
>
> def func(list L not None):
>
> How about this:
>
> def func(object obj not None):
>
> which should likely behave the same as this:
>
> def func(obj not None):
>
> I assume that this should also be allowed and behave like the other
> extension types, right?
No, I would actually make an exception here--normally
def func(Type x not None)
throws an error if and only if not isinstance(x, Type). The "object"
type is different is not really treated like an extension type. If
something is "[object] obj not None" then I think it should actually
reject None.
- Robert
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