Re: [Pyobjc-dev] Bridging of Strings

[Ronald O. <ous...@ci...>]

On Monday, Dec 30, 2002, at 01:15 Europe/Amsterdam, David Eppstein 
wrote:

> On 12/23/02 8:30 PM +0100 Ronald Oussoren <ous...@ci...> wrote:
>>> ValueError: NSInvalidArgumentException - *** -count only defined for
>>> abstract class.  Define -[NSCFArray count]!
>>>
>>
>> That's just like in 'normal' python types: If you call NSArray.count  
>> you
>> get the count method defined by NSArray instead of the one defined  by
>> the class of your object. That is not very Objective-C-like, but  
>> this is
>> needed to implement super(cls, self).count().
>
> A possibly related recent surprise I had:
> I had an NSArray object X (or its Python proxy) and attempted to 
> retrieve X[-1].
> Got an NSRangeError rather than the expected last array item.
> Trivial to work around, but shouldn't this work?

Yup, it's a bug. I'll check in a fix later today.

>
>> That's not really a problem, just use the strint literal
>> "localizedCaseInsentiveCompare:" as the argument off
>> NSArray.sortedArrayUsingSelector_. By the time strings NSArray methods
>> touch the strings in an array they will be converted to NSString  
>> (that's
>> even true if the NSArray is the OC_PythonArray proxy for a  python
>> sequence).
>
> Well, except that what I really want to sort isn't an NSArray of 
> strings, it's a Python list of Python dictionaries, which I want to 
> sort according to the (localized case-independent) string values 
> stored under one of the keys in each dictionary.

It will be possible to use 
'NSString.localizedCaseInsensitiveCompare_("foo", "bar")' in the next 
release. Until that time you could use the workaround described by 
Bill. Or if your brave you could use the CVS version that already 
contains this update ;-).

Ronald