[Pyobjc-dev] DictType -> ObjC

[Bill B. <bb...@co...>]

Ronald,

     How hard would it be to proxy DictType, ArrayType, and TupleType 
into Obj-C such that they look/feel/act/behave/are subclasses of 
NSDictionary and NSArray?

     That is, such that they implement the primitive methods of the 
NSDictionary/NSArray class clusters and internally use the Py* APIs to 
retrieve/set values [converting as necessary]?

     This would be significantly valuable in that it doesn't imply a 
conversion as the objects come across the bridge from Python->ObjC, yet 
they would be compatible with NSDictionary/NSArray and friends.

     Also-- should the following slice fail in the way that it does?  (I 
included the last two lines only because it raises the question as to 
whether or not NSNumber/NSValue should be converted across the bridge 
-- I'm not sure that there is a really clear answer).

[bumbox:IssueCenter/V3/Python] bbum% python
Python 2.2 (#1, 07/14/02, 23:25:09)
[GCC Apple cpp-precomp 6.14] on darwin
Type "help", "copyright", "credits" or "license" for more information.
 >>> from Foundation import *
 >>> x = NSMutableArray.array()
 >>> x.addObject_(1)
 >>> x.addObject_(2)
 >>> x.addObject_(3)
 >>> x.addObject_(4)
 >>> x.addObject_(5)
 >>> y = [1,2,3,4,5]
 >>> y[2:4]
[3, 4]
 >>> x[2:4]
Traceback (most recent call last):
   File "<stdin>", line 1, in ?
   File "/usr/lib/python2.2/site-packages/objc/__init__.py", line 152, 
in <lambda>
     CONVENIENCE_METHODS['objectAtIndex:'] = ('__getitem__', lambda 
self, arg: self.objectAtIndex_(arg))
TypeError: expected an integer for argument 1: its typespec is 'I'
 >>> y[0]
1
 >>> x[0]
<NSCFNumber objective-c instance 0xc1a7c0>
 >>>


     b.bum