Mark Dickinson added the comment: Unfortunately, I don't think the checking first approach can work either: in the case where the object *does* accept assignments, it will now be assigned to twice. If there are side-effects from those assignments, then that will change behaviour.
An example is the Enthought traits library, where assignment to a list item causes a notification to be fired; with this change, listeners would now receive two events instead of one. I suspect there just isn't a good solution here. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue17973> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
