python game.py doesn't run

import sys

from player import Player
from monster import Dragon
from monster import Goblin
from monster import Troll


class Game:

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

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

  def hit(self, creature):
    if creature == 'monster':
      self.monster.hit_points -= 1
    elif creature == 'player':
      self.player.hit_points -= 1


  def monster_turn(self):
    if self.monster.attack():
      print('{} is attacking!'.format(self.monster))

      if input('Dodge? Y/N ').lower() == 'y':
        if self.player.dodge():
          print('{} dodged the attack!'.format(self.player))
        else:
          print('{} got hit anyway'.format(self.player))
          self.hit('player')
      else:
        print('{} hit you for 1 point!'.format(self.monster))
        self.player_hit('player')
    else:
      print('{} isn\'t attacking this turn'.format(self.monster))


  def player_turn(self):
    player_choice = input("[A]ttack, [R]est, [Q]uit? ").lower()
    if player_choice == 'a':
      print("You're 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.hit('monster')
          else:
            self.hit('monster')

          print('You hit {} with your {}: '.format(
              self.monster, self.player.weapon))
      else:
        print('You missed!')
    elif player_choice == 'r':
      print('You rest and gain 1 hit point!')
      self.player.rest()
    elif player_choice == 'q':
      sys.exit()
    else:
      self.player_turn()


    def cleanup(self):
      if self.monster.hit_points <= 0:
        self.player.experience += self.monstre.experience

        print('You killed {}: '.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!')
      elif self.monster or self.monsters:
        print('You lose')
      sys.exit()

Game()