[PythonLabs] Re: [Python-Dev] Re: [Python-checkins]python/dist/src/Modules gcmodule.c,2.33.6.5,2.33.6.6 (original) (raw)

Jim Fulton jim@zope.com
Sun, 06 Apr 2003 07:07:44 -0400

Tim Peters wrote:

...

While a getattr side effect may resurrect an object in gc's unreachable list, gc has no way to know that an object has been resurrected short of starting over again. In the absence of that, the object remains in gc's unreachable list, and its tpclear slot eventually gets called. The internal C stuff remains self-consistent, so this won't cause a segfault (etc), but it may (as above) be surprising. I don't see a sane way to fix this so long as asking whether del exists can execute arbitrary mounds of Python code.

If I understand the problem, it can be avoided by avoiding old-style classes.

Maybe it's time to, at least optionally, cause a warning when old-style classes are used. :) I'm not kidding for Zope. I think it might be worth-while to be issue such a warning in Zope.

Jim

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