On Mar 16, 1:21 pm, Sean DiZazzo <half.ital...@gmail.com> wrote: > Why is it that you can setattr() on an instance of a class that > inherits from "object", but you can't on an instance of "object" > itself? > > >>> o = object() > >>> setattr(o, "x", 1000) > > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > AttributeError: 'object' object has no attribute 'x'
I suppose you cannot set attributes to instances of any built-in classes, i.e. int(), list() etc. > >>> class Object(object):pass > ... > >>> o = Object() > >>> setattr(o, "x", 1000) > >>> o.x > > 1000 > > I notice that the first example's instance doesn't have a __dict__. > Is the second way the idiom? > > ~Sean Since all classes inherit from object, I suppose the definition can be as simple as 'class Object:pass', and assignment can be as simple as 'o.x = 1000' A. Syukri -- http://mail.python.org/mailman/listinfo/python-list
