Re: [Pyobjc-dev] PythonBrowser example/study + bug report

[Just v. R. <ju...@le...>]

Ronald Oussoren wrote:

> > It can't include a proper traceback? (Sorry if this is naive, I
> > know nothing about exceptions in ObjC yet.)
> 
> That's another possibility, is there a function to translate a 
> traceback to a string (PyErr_Print writes to a file)?

Hm, I can't find anything in C. If you can call back to Python, you can use the
traceback module. If you want I can try to write a C function that calls
traceback.py.

> > On the other hand: wouldn't subclassing the module class also be an
> > opportunity to speedup loading of Foundation and AppKit by doing
> > things lazily? Oh, I don't think we need to subclass module at all:
> > we can just inject an arbitrary object into sys.modules; I just
> > tried it, and even "from FakeModule import *" works just fine.
> 
> But wouldn't 'from AppKit import *' stop working if the AppKit 'module' 
> creates the proxies lazily?

Not if the object has an __all__ attribute (I played around with this the other
day: for star-imports to work the object must either have an __all__ attribute
or a __dict__ atribute. I'm pretty sure __all__ is checked first.

> I've done some experiments to find why 
> importing AppKit is as slow as it is. Actually loading the framework 
> isn't that expensive, the problem is really in creating all proxy 
> classes and specifically in walking the method-tables of Objective-C 
> classes. I'll check if I can somehow postpone this until it is really 
> needed (someone doing dir(NSObject) or creating an instance of the 
> proxy [or one of its subclasses]).
>
> My local tree is already somewhat faster by somewhat optimizing 
> existing code and moving the actual loading code to Objective-C.

"Somewhat" isn't quite enough I think... It would be nice if small apps could
start up quickly.

I think it's worthwhile to play with a fake module object implementing a
__getattr__ hook. How much of this proxy-building code is written in Python, if
any? If it's in (Obj)C, can you point me to the code so I can try to understand
it?

Just