[EMAIL PROTECTED] wrote: > Thanks to everyone who posted comments or put some thought into this > problem. > > I should have been more specific with what I want to do, from your > comments the general case of this problem, while I hate to say > impossible, is way more trouble than it's worth. > > By modified I meant that the dictionary has been changed from its > original (constructed) state by either: > 1) A new element was added > 2) An existing element was changed > > I want to wrap a dictionary of cookies in mod_python. Cookies are > represented as objects with no methods. In light of this and Michael's > excellent post, I came up with the following code. > > class CookieCollection(dict): > def __init__(self, d): > for k, v in d: > v.__setattr__ = self.__wrap_setattr(v.__setattr__) > self[k] = v
I don't think this will work if v is an instance of a new-style class - for new-style classes, special methods are always looked up on the class, you can't override them in an instance. For example: >>> class foo(object): ... def __setattr__(self, attr, value): ... print 'foo.__setattr__' ... object.__setattr__(self, attr, value) ... >>> f=foo() >>> f.x = 3 foo.__setattr__ >>> def new_setattr(attr, value): ... print 'new_setattr' ... >>> f.__setattr__ = new_setattr foo.__setattr__ >>> f.y=3 foo.__setattr__ still calls foo.__setattr__() Kent -- http://mail.python.org/mailman/listinfo/python-list
