[Python-Dev] Quick-and-dirty weak references

[M.-A. Lemburg]

Vladimir Marangozov wrote:
> 
> [about mxProxy, WeakProxy]
> 
> M.-A. Lemburg wrote:
> >
> > Could you tell me where the core dump originates ? Also, it would
> > help to compile the package with the -DMAL_DEBUG switch turned
> > on (edit Setup) and then run the same things using 'python -d'.
> > The package will then print a pretty complete list of things it
> > is doing to mxProxy.log, which would help track down errors like
> > these.
> >
> > BTW, I get:
> > >>> print p
> >
> > Traceback (innermost last):
> >   File "<stdin>", line 1, in ?
> > mxProxy.LostReferenceError: object already garbage collected
> > >>>
> >
> > [Don't know why the print statement prints an empty line, though.]
> >
> 
> The previous example now *seems* to work fine in a freshly launched
> interpreter, so it's not a good example, but this shorter one
> definitely doesn't:
> 
> >>> from Proxy import WeakProxy
> >>> o = []
> >>> p = q = WeakProxy(o)
> >>> p = q = WeakProxy(o)
> >>> del o
> >>> print p or q
> Illegal instruction (core dumped)
> 
> It crashes in PyDict_DelItem() called from mxProxy_CollectWeakReference().
> I can mail you a complete trace in private, if you still need it.

That would be nice (please also include the log-file), because I get:
>>> print p or q
Traceback (innermost last):
  File "<stdin>", line 1, in ?
mxProxy.LostReferenceError: object already garbage collected
>>>

Thank you,
-- 
Marc-Andre Lemburg
______________________________________________________________________
Y2000:                                                   135 days left
Business:                                      http://www.lemburg.com/
Python Pages:                           http://www.lemburg.com/python/