On Sun, Aug 3, 2014 at 10:40 PM, Roy Smith <r...@panix.com> wrote: > I usually just do: > > class Data: > pass > my_obj = Data() > > That's all you really need. It's annoying that you can't just do: > > my_obj = object() > > which would be even simpler, because (for reasons I don't understand), > you can't create new attributes on my_obj.
Python 3.4 on Windows (32-bit): >>> import sys >>> class Data: pass >>> sys.getsizeof(Data()) 32 >>> sys.getsizeof(object()) 8 Even before you add a single attribute, the object is four times the size it needs to be. When you need a sentinel (for a function's default argument, for instance), you don't need any attributes on it - all you need is some object whose identity can be tested. And the excess would be multiplied by a fairly large number of objects in the system (it's not just object() that doesn't take attributes). If you want a bag of attributes, get a bag of attributes, don't expect object() to be it :) The only reason I can think of for expecting a basic object to work this way is because of the parallel with ECMAScript; it's not a fundamental part of the type hierarchy. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
