[Pyobjc-dev] DeprecationWarning: Not all Objective-C arguments are present in the Python argument-list

[James R E. <ea...@cc...>]

I've been using the following decorator in PyObjC 1.4 without  
problems, but now PyObjC 2.0 gives me a nice DeprecationWarning.  Am I  
doing something naughty and/or dangerous?  If so, is there a safer way  
to accomplish the same thing in PyObjC2?

First, the decorator:

def trap_exceptions(func):
     ''' Trap exceptions and prevent them from being passed along to  
the ObjC runtime. '''
     def trapper(self, *args, **kwargs):
         try:
             return func(self, *args, **kwargs)
         except:
             sys.stderr.write('Exception in %s: ' % (func.__name__))
             traceback.print_exception(*sys.exc_info())
     return trapper

Typical usage is on an Objective-C entrypoint.  e.g.:

     @trap_exceptions
     def performDragOperation_(self, sender):
         if self.delegate is not None \
                 and  
self.delegate.respondsToSelector_('performDragOperation:'):
             return self.delegate.performDragOperation_(sender)
         return False

This worked fine pre-Leopard.  When an exception was thrown somewhere  
in (e.g.) performDragOperation_, I'd get a stack trace on the console  
and everything would carry along as if nothing happened.  In PyObjC2,  
the decorator appears to behave as expected, but I also get this  
warning for every @trap_exceptions'ed method (at NIB load time):

/System/Library/Frameworks/Python.framework/Versions/2.5/Extras/lib/ 
python/PyObjC/PyObjCTools/NibClassBuilder.py:219: DeprecationWarning:  
Not all Objective-C arguments are present in the Python argument-list  
of <unbound selector observeValueForKeyPath:ofObject:change:context:  
of CBIconView at 0x4f1fef0>
   return metaClass(name, bases, methods)

Thanks!
James

PS:  Thanks for all the work you've done on PyObjC 2.0.  There are  
lots of wonderful improvements here!  I'm very much looking forward to  
the Tiger backport. :-)

--
Doctors are sadists who like to play God and watch lesser people scream
			-- Bren MacGuff in "Juno"