Why is my code not working?

import sys

from character import Character
from monster import Dragon
from monster import Goblin
from monster import Troll


class Game:

    def setup(self):
        self.player = Character()
        self.monsters = [
            Goblin(),
            Troll(),
            Dragon()
            ]
        self.monster = self.get_next_monster()


        def monster_turn(self):
            if self.monster.attack():
                print("The {} is attacking!".format(self.monster))
                want_dodge = input("Do You want to dodge?(Y/N): ").lower()
                if want_dodge == 'y':
                    if not self.player.dodge():
                        self.got_hit()
                        print("You got hit!")
                    else:
                        print("You dodged!")
                else:
                    print("The {} has hit you for 1 point!".format(self.monster))
                    self.got_hit()
            else:
                print("Your a lucky guy the {} isn't attacking".format(self.monster))

        def player_turn(self):
            player_choice = input("Do you want to attack, rest or quit?(a/r/q): ").lower()
            if player_choice == 'q':
                print("See you next time by.")
                sys.exit()
            elif player_choice == 'a':
                print("You are attaking the {}".format(self.monster))
                if self.player.attack():
                    if self.monster.dodge():
                        print("OH no it dodged")
                    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()
            else:
                self.player_turn()

        def got_hit(self):
            self.player.hit_points -=1

        def get_next_monster(self):
            try:
                return self.monsters.pop(0)
            except IndexError:
                return None


        def cleanup(self):
            if self.monster.hit_points <=0:
                self.player.experience += self.monster.experience
                print("You have killed the {}!".format(self.monster))
                self.monster = self.get_next_monster()

        def __init__(self):
            self.setup()

            while self.player.hit_points and (self.monster or self.monsters):
                print('\n'+'='*20)
                print(self.player)
                self.monster_turn()
                print('-'*20)
                self.player_turn()
                self.cleanup()
                print('\n'+'='*20)

            if self.player.hit_points:
                print("You win!")
                sys.exit()
            elif self.monsters or self.monster:
                print("You lose!")
                sys.exit()

Game()