New submission from Chinmay Kanchi <cgkan...@gmail.com>: Attempting to override a special method of an object of a builtin (like list) raises an AttributeError. This is obviously by design. However, doing the same to a user-defined function object seemingly replaces the function, but does not have the expected effect. In the interests of consistency, attempting to change a special method of a function object should raise an AttributeError stating that the property/method is read-only.
>>> a_list = list() >>> a_list.__repr__ = lambda: '[]' Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'list' object attribute '__repr__' is read-only >>> def f(): pass >>> f.__repr__ = lambda: 'f' >>> f.__repr__ <function <lambda> at 0x6482b0> >>> repr(f) #would expect it to return 'f' since no error was raised '<function f at 0x6481f0>' >>> f.__repr__() #so the change is half-way made, inconsistent and possibly >>> problematic 'f' >>> ---------- components: Interpreter Core messages: 123589 nosy: Chinmay.Kanchi priority: normal severity: normal status: open title: Attempting to override special methods of a function object does not cause an error type: behavior versions: Python 2.6 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue10649> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
