New submission from Daniel Stutzbach <dan...@stutzbachenterprises.com>:
For operations that test membership in a set, Python coerces sets and subclasses of set into a temporary frozenset before testing membership. For example, this works: >>> set() in set([frozenset()]) True Although the set() is not hashable itself, Python creates a temporary frozenset() out of the set(). It should do the same for user-types derived from collections.Set, so they can inter-operate in the same way. In setobject.c, the following methods behave in the described manner: set_contains, set_remove, and set_discard. ---------- components: Interpreter Core messages: 105983 nosy: stutzbach priority: normal severity: normal stage: unit test needed status: open title: set_contains, etc. should check for collections.Set in addition to PySet_Check type: behavior versions: Python 2.7, Python 3.2 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue8752> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
