New submission from Jeffrey Yasskin <[EMAIL PROTECTED]>: >>> class Meta(type): ... def __instancecheck__(self, other): ... return False >>> isinstance(3, Meta)
In 2.6, this results in: Traceback (most recent call last): File "<stdin>", line 1, in <module> RuntimeError: maximum recursion depth exceeded while calling a Python object (That's a recursion in C, through PyObject_IsInstance and instancemethod_call) In 3.0, I get: Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: __instancecheck__() takes exactly 2 positional arguments (1 given) ---------- components: Interpreter Core messages: 63671 nosy: jyasskin severity: normal status: open title: isinstance(anything, MetaclassThatDefinesInstancecheck) raises instead of returning False type: behavior versions: Python 2.6, Python 3.0 __________________________________ Tracker <[EMAIL PROTECTED]> <http://bugs.python.org/issue2325> __________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
