On Thu, 2002-05-16 at 09:12, Russell A. Blank wrote: > Thank you for your help. We were doing exactly that. I just converted the > module reference to a singleton and it works great. I have also run into > some other issues under Python 2.2. Apparently, cPickle cannot pickle > classes with slots without definging a getstate. I have created a > work-around, but I thought everyone should know that session store will > raise an error with slots.
Thank you for the heads up. I had just started using slots, but had not gotten to pickling them yet. In [1]Python 2.2.1c1 we see a first stab at a solution: ----------------------- What's New in Python 2.2.1c1? Release date: 18-Mar-2002 ============================= This is primarily a bugfix release. Many bugs have been fixed since the release of 2.2 final. Some of the more notable are listed here. Core and builtins - If you try to pickle an instance of a class that has __slots__ but doesn't define or override __getstate__, a TypeError is now raised. This is done by adding a bozo __getstate__ to the class that always raises TypeError. (Before, this would appear to be pickled, but the state of the slots would be lost.) ----------------------- OK, so this makes you *aware* of the problem, but it doesn't *fix* it. 8-( 1. <http://www.python.org/2.2.1/NEWS.txt> The thread beginning with [2] is interesting. I am now adopting a personal style guideline to specify all of my __slots__ as tuples. 2 http://mail.python.org/pipermail/python-dev/2002-February/020072.html If you add inheritance to the mix, the __(g|s)etstate__ methods quickly become very nasty. Perhaps the updated Persistent mixin in zodb3 is the best solution. See Message-ID: <[EMAIL PROTECTED]> in [3] 3. http://lists.zope.org/pipermail/zodb-dev/2002-February.txt _______________________________________________________________ Have big pipes? SourceForge.net is looking for download mirrors. We supply the hardware. You get the recognition. Email Us: [EMAIL PROTECTED] _______________________________________________ Webware-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/webware-devel
