En Tue, 30 Jan 2007 20:31:26 -0300, Létező <[EMAIL PROTECTED]> escribió:
> I use Python 2.5, Win32 MSI release. > > Setting attributes on an empty object does not work: > >>>> a=object() > >>>> a.x=1 > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > AttributeError: 'object' object has no attribute 'x' > > > However using an empty new style class works fine: > >>>> class C(object): pass > ... >>>> c=C() >>>> setattr(c, 'x', 1) >>>> > > The dir(c) function indicates, that the C instance has a __dict__ > attribute. > > Why don't have an object() instance a __dict__ attribute by default? Because it's not needed, and creating an empty dict has some cost. If you need a class with __dict__, just inherit from object as you already have noted. > This may need some explanation in the Python manual. Maybe. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
