Hello, It is known to be cumbersome to write a proxy type that will correctly proxy all special methods (this has to be done manually on the type, since special methods are not looked up on the instance: a __getattr__ method would not work).
Recently we've had reports of two stdlib types that forgot to implement some special methods: - weakref.proxy doesn't implement __reversed__: http://bugs.python.org/issue19359 - mock.MagicMock doesn't implement __truediv__: http://bugs.python.org/issue20968 In http://bugs.python.org/issue19359#msg213530 I proposed to introduce a "proxy protocol" (__proxy__ / tp_proxy) that would be used as a fallback by _PyObject_LookupSpecial to fetch the lookup target, i.e.: def _PyObject_LookupSpecial(obj, name): tp = type(obj) try: return getattr(tp, name) except AttributeError: return getattr(tp.tp_proxy(), name) What do you think? Regards Antoine. _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
