code: def last_first_id(self):
          
          return ("{}{} ".format(self.last_name, ", " + self.first_name if self.first_name else "") + ("({}) ".format(self.nickname)
                                                                                                       if self.nickname else "") +
                  ("({})".format(self.student_id if self.is_student and self.student_id else self.username)))
docs: Return a name in the format of:
              Lastname, Firstname [(Nickname)] (Student ID/ID/Username)