<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 async def remember(self, request, user_id):
 """Called to store the userid for a request. This function creates a ticket from the request and user_id, and calls the abstract function remember_ticket() to store the ticket. Args: request: aiohttp Request object. user_id: String representing the user_id to remember """

        ticket = self._new_ticket(request, user_id)
        await self.remember_ticket(request, ticket)