Bugs item #1263635, was opened at 2005-08-19 02:07 Message generated for change (Comment added) made by gbrandl You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1263635&group_id=5470
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Python Interpreter Core Group: Python 2.4 >Status: Closed >Resolution: Wont Fix Priority: 5 Submitted By: Per Vognsen (pervognsen) Assigned to: Nobody/Anonymous (nobody) Summary: type() and isinstance() do not call __getattribute__ Initial Comment: The built-in functions type() and isinstance() do not call __getattribute__ for instances of user-defined classes. Thus, for instance, x.__class__ == sometype and type(x) == sometype can give inconsistent results. I ran into this problem in writing a transparent persistence system, where instances of proxy classes are used as stand-ins for unloaded objects and the proxy does just-in-time loading by overloading __getattribute__ and __setattr__ (which changes __class__). (This applies to 2.4.1.) ---------------------------------------------------------------------- >Comment By: Georg Brandl (gbrandl) Date: 2006-02-20 22:10 Message: Logged In: YES user_id=849994 Closing as I feel Raymond's right. ---------------------------------------------------------------------- Comment By: Raymond Hettinger (rhettinger) Date: 2005-08-26 08:48 Message: Logged In: YES user_id=80475 I don't think this is going to change. A number of builtins directly access an object's structure and do not respect overrides via __getattribute__. This is somewhat intrinsic the Python's current design. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1263635&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
