[EMAIL PROTECTED] wrote: > I am using Python 2.4.3 > >>>>class K(object,list): > ...: pass > ...: > ------------------------------------------------------------ > Traceback (most recent call last): > File "<console>", line 1, in ? > TypeError: Error when calling the metaclass bases > Cannot create a consistent method resolution > order (MRO) for bases object, list
class K(object, list): pass specifies that a method should be looked up first in object, then in list. As list inherits from object, its method resolution order >>> list.__mro__ (<type 'list'>, <type 'object'>) specifies that a method should be looked up first in list, then in object. Python refuses to resolve the conflict for you, but you can do it manually: >>> class K2(list, object): pass ... >>> K2.__mro__ (<class '__main__.K2'>, <type 'list'>, <type 'object'>) Now K2, list, and object can agree to look for a method in K2, then list, then object. However, you get the same effect by just inheriting from list: >>> class K3(list): pass ... >>> K3.__mro__ (<class '__main__.K3'>, <type 'list'>, <type 'object'>) Peter -- http://mail.python.org/mailman/listinfo/python-list
