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

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

To finally really get starting and building a little Cocoa app myself, I tried
to build a rudimentary Python Object browser. I've attached the code + nib etc,
I'd be happy to check it into the Examples directory.


Question:

I needed to subclass NSObject and was a little confused that it doesn't by
default behave more like a Python object. I wrote a __new__ method in my
subclass that does this:

    def __new__(cls, *args, **kwargs):
        return cls.alloc().init()

Now I can instantiate an NSObject subclass like I would instantiate an Python
object: even the __init__() is now also called. Is there anything against adding
some more Python flavor to the Python wrapper of NSObject? Hm, that's probably a
very naive request, and might interfere with the Obj-C idiom. I'm I right that
the above will only work when instantiation is done from Python, and not from
Obj-C? Ok, forget about it, I'll just use the above in a superclass of my own
somewhere until I understand more of the implications...


Bug/Feature request:

When an exception is raised in a method that is called by the objc runtime, only
a very brief error is printed to Console.app. Can this be changed so it does
PyErr_Print(), which prints a complete Python traceback? Oh, and _after_ the
brief error is printed, the program usually crashes hard:

2002-11-30 15:31:22.990 python2.3[21902] An uncaught exception was raised
2002-11-30 15:31:22.991 python2.3[21902] No attribute allow
2002-11-30 15:31:22.992 python2.3[21902] *** Uncaught exception:
<OC_PythonException> No attribute allow
Nov 30 15:27:25 python last message repeated 13 times

Nov 30 15:31:24 python crashdump: Crash report written to:
/Users/just/Library/Logs/CrashReporter/python2.3.crash.log

2002-11-30 15:31:24.633 Console[20835] Exception raised during posting of
notification.  Ignored.  exception: *** NSRunStorage, _NSBlockNumberForIndex():
index (36561) beyond array bounds (36561)

This makes it quite painful to debug an app.

Just