On Mon, Feb 29, 2016, at 10:36, ast wrote: > but why doesn't it work with built-in classes int, float, list.... ? > > L = [1, 8, 0] > L.test = 'its a list !' > > (however lists are mutable, int, float ... are not)
Because those classes do not have attribute dictionaries, in order to save space. You can make a class without an attribute dictionary, by using __slots__. -- https://mail.python.org/mailman/listinfo/python-list