<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def add_item(self, item):
 """Append item to the list. :attr:`last_updated` will be set to :py:meth:`datetime.datetime.now`. :param item: Something to append to :attr:`items`. """

        self.items.append(item)
        self.last_updated = datetime.datetime.now()