part i dont understand in game.py

def player_turn(self):

        player_choice = input("[A]ttack, [R]est or [Q]uit? ").lower()
            if player_choice == 'a':
                print("You are attacking {}!".format(self.monster))

                if self.player.attack:
                    if self.monster.dodge():
                        print('{} dodged your attack!'.format(self.monster))
                    else:
                        if self.player.leveled_up():
                            self.monster.hit_points -= 2
                        else:
                            self.monster.hit_points -= 1
                        print('You hit {} with your {}'.format(
                            self.monster, self.player.weapon))
                else:
                    print("you missed!")


            elif player_choice == 'r':
                self.player.rest()

            elif player_choice == 'q':
                sys.exit()
            else:
                self.player_turn()