On Jul 20, 2006, at 3:26 AM, Greg Ewing wrote: > Ronald Oussoren wrote: > >> Classic classes? > > I just checked, and it seems they've been fixed too: > callable() and hasattr(obj, '__call_') give the same > result -- true if and only if a __call__ method has > been defined.
But classic classes theirself are callable yet don't have a __call__ attribute. New-style classes do have a call method. To expand on my previous interpreter session: Python 2.5b2 (r25b2:50570, Jul 11 2006, 09:46:24) [GCC 4.0.1 (Apple Computer, Inc. build 5341)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> class O: pass # Old-style class ... >>> O.__call__ # No __call__ Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: class O has no attribute '__call__' >>> class N (object): pass # New-style class ... >>> N.__call__ # Has __call__ <method-wrapper '__call__' of type object at 0x60f770> >>> >>> # Instantition by calling works for both: >>> O() <__main__.O instance at 0x701c0> >>> N() <__main__.N object at 0x6e410> >>> Ronald _______________________________________________ Python-3000 mailing list Python-3000@python.org http://mail.python.org/mailman/listinfo/python-3000 Unsubscribe: http://mail.python.org/mailman/options/python-3000/archive%40mail-archive.com
