[Pyobjc-dev] experiences using pyobjc+pychecker?

[David E. <epp...@ic...>]

Hi, is anyone else using pychecker and pyobjc together successfully?
I just did several things at once: upgrade to 10.3 (and the command-line 
python that comes with it); upgrade to yesterday's cvs version of 
PyObjC, and start trying the new pychecker that was just announced 
yesterday.  When I try pychecker on a very short PyObjC source file, I 
get a bus error:

Hyperbolic% pychecker unicmp.py
Processing unicmp...
/usr/local/bin/pychecker: line 3:  4306 Bus error               
/usr/bin/python 
/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/si
te-packages/pychecker/checker.py "$@"
Hyperbolic% cat unicmp.py
"""unicmp.py

More intelligent collation ordering for unicode strings.
Requires Mac OS X and PyObjC.
Designed to be a plug-in replacement for the usual cmp function.

D. Eppstein, October 2003.
"""

from Foundation import NSString

def unicmp(u1,u2):
    if not isinstance(u1,(str,unicode)) or not 
isinstance(u2,(str,unicode)):
        return cmp(u1,u2)
    return NSString.localizedCaseInsensitiveCompare_(u1,u2) or 
cmp(u1.lower(),u2.lower())


I am unsure whether this indicates something wrong with my code (I doubt 
it since it's so short), a problem with PyObjC, a problem with 
pychecker, or what.  PyObjC appears to be functioning normally when I 
actually run it, and pychecker appears to be functioning normally when I 
try it on non-PyObjC-based code.

Neal Norwitz, pychecker's maintainer, writes:
> There's no way Python should crash when running pychecker.  pychecker 
> has no C modules.
> 
> Pychecker may have a bug too, but that can't be determined until the 
> interpreter doesn't crash.
> 
> It's possible that there is a double free in the extension module(s). 
> This was a problem in wxWindows a long time ago.  Since pychecker 
> does the imports differently, the bug isn't usually found.

-- 
David Eppstein                      http://www.ics.uci.edu/~eppstein/
Univ. of California, Irvine, School of Information & Computer Science