code: def save(self, replace=True):
          
          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)
docs: 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.