<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def set_session_token(self, session_token):
 """ Sets session token and new login time. :param str session_token: Session token from request. """

        self.session_token = session_token
        self._login_time = datetime.datetime.now()