New submission from Robert Burke <sharpobj...@gmail.com>: If you create a subclass of set but do not override __or__, __and__, __xor__, and __sub__, calling these functions will yield a new instance of your subclass. The new instance will never have __init__ called on it. Depending on what you expect __init__ to do, this can cause problems later on.
The simplest solution would be to make these functions work like list.__add__. If you have two instances of some list subclass (foo and bar), type(foo.__add__(bar)) will just be list. ---------- files: demo messages: 133880 nosy: Robert.Burke priority: normal severity: normal status: open title: __or__, __and__, __sub__, and __xor__ instantiate subclass of set without calling __init__ type: behavior versions: Python 2.6 Added file: http://bugs.python.org/file21680/demo _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue11854> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
