Saves this item to SDB.
        
        :param bool replace: If ``True``, delete any attributes on the remote
            SDB item that have a ``None`` value on this object.

def save(self, replace=True):
        """
        Saves this item to SDB.
        
        :param bool replace: If ``True``, delete any attributes on the remote
            SDB item that have a ``None`` value on this object.
        """
        self.domain.put_attributes(self.name, self, replace)
        # Delete any attributes set to "None"
        if replace:
            del_attrs = []
            for name in self:
                if self[name] == None:
                    del_attrs.append(name)
            if len(del_attrs) > 0:
                self.domain.delete_attributes(self.name, del_attrs)