New submission from johannes raggam <raggam...@adm.at>: when declaring a abstract base class with an abstract property or method and subclassing from dict, the class is instantiable (instanceable?).
>>> import abc >>> class A(object): ... __metaclass__ = abc.ABCMeta ... @abc.abstractproperty ... def abstract(self): return True ... >>> a = A() Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: Can't instantiate abstract class A with abstract methods abstract >>> >>> class A2(dict): ... __metaclass__ = abc.ABCMeta ... @abc.abstractproperty ... def abstract(self): return True ... >>> a2 = A2() >>> although, when using the dict definition from __builtin__.pi directly, the abc behaves like expected. but this may be a bug in the c-implementation from dict. platform: Python 2.6.2 (r262:71600, Apr 25 2009, 21:56:41) [GCC 4.3.2] on linux2 ---------- components: Library (Lib) messages: 87574 nosy: thet severity: normal status: open title: abstract class instantiable when subclassing dict type: behavior versions: Python 2.6 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue5996> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
