1 2 3 4 5 6 7 8 9 | >>> class z(dict): pass ... >>> {}.__le__(1) NotImplemented >>> z().__le__(1) PyDictionary.__le__ Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: dict.__cmp__(x,y) requires y to be 'dict', not a 'int' |