Hello all, I would like to propose to following simplifications to the copy protocol (a.k.a the __reduce__ method):
- Remove the type.__reduce_ex__ method and define __reduce__ method to take a single optional integer argument that is the pickle protocol version to use. And since this already the current behavior of __reduce__, no change is required. - Deprecate copyreg.pickle in favor of the __getnewargs__ special method. They both solve the exact same problem, but __getnewargs__ does it in a simpler and more robust manner. - Make __reduce__ raise a TypeError if the class of an instance derives from one or more extension type (object, list and dict excluded) and neither __getnewargs__ nor __getstate__ is defined. I believe that these changes will make it easier for developers to write classes that supports the copy protocol, which is already quite complex in addition of being poorly documented. Evidently, I will provide the patches and write the documentation for these changes. Cheers, -- Alexandre _______________________________________________ Python-3000 mailing list Python-3000@python.org http://mail.python.org/mailman/listinfo/python-3000 Unsubscribe: http://mail.python.org/mailman/options/python-3000/archive%40mail-archive.com
