George Sakkis wrote: > - Where do the attributes of a datetime.date instance live if it has > neither a __dict__ nor __slots__ ? > - How does dir() determine them ?
py> from datetime import date py> d = date(2003,1,23) py> dir(date) == dir(d) True py> for attr_name in ['day', 'month', 'year']: ... attr_val = getattr(date, attr_name) ... print attr_name, type(attr_val) ... day <type 'getset_descriptor'> month <type 'getset_descriptor'> year <type 'getset_descriptor'> So all the instance "attributes" are actually handled by descriptors on the type. So datetime.date objects don't really have any instance attributes... > - dir() returns the attributes of the instance itself, its class and > its ancestor classes. Is there a way to determine the attributes of > the instance alone ? I'm just guessing now, but perhaps if no __dict__ or __slots__ is available, all instance "attributes" are managed by descriptors on the type? STeVe -- http://mail.python.org/mailman/listinfo/python-list
