code: def last_first_initial(self):
          
          return ("{}{} ".format(self.last_name, ", " + self.first_name[:1] + "." if self.first_name else "") + ("({}) ".format(self.nickname)
                                                                                                                 if self.nickname else ""))
docs: Return a name in the format of:
              Lastname, F [(Nickname)]