On Mon, Feb 29, 2016 at 9:06 AM, Random832 <random...@fastmail.com> wrote: > 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__.
You can also make a list that does have an attribute dictionary by subclassing it. >>> class MyList(list): pass ... >>> obj = MyList() >>> obj.test = 'foo' -- https://mail.python.org/mailman/listinfo/python-list
