Can't spot the mistake: The Final Push/Dragon game

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

    def monster_turn(self):
      if self.monster.attack():
        print("{} is attacking!".format(self.monster))
        # check to see, if the monster attacks
        # if so, tell the player

        if input("Dodge? Y/N").lower()=="y":
          # check if the player wants to dodge
          if self.player.dodge():
            # if so, see if the dodge is succesful
            # if it is, move on
            print("You dodged the attack.")
          else:
            print("You got hit anyway.")
            self.player.hit_points-=1
            # if it's not, remove one player hit_point
        else:
          print("{} hit you for 1 point!".format(self.monster))
          self.player.hit_points-=1
      else:
        print("{} isn't attacking this turn.".format(self.monster))
        # if the monster isn't attacking, tell that to the playere too

    def player_turn(self):
        player_choice=input("[A]ttack, [R]est, [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()





        # let the player attack, rest or quuit
        # if they attack:
            # see if the attack is succesful
                # if so, see if the monster dodges
                  # if dodged, print that
                  # if not dodged, subtract the right num of hit_points from the monster
                # if not a good attack, tell the player
        # if they rest:
            # call the player.rest() method
        # if they quit, exit the game
        # if they pick anythin else, re-run this method


    def cleanup(self):
        if self.monmster.hit_points<=0:
           # if the monster has no more hit_ponts
          self.player.experience+=self.monster.experience
          # up to the player's experience

          print("You killed {}!".format(self.monster))
        # print a message

        self.monster=self.get_next_monster()
        # Get a new 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.clean_up()
          print("\n"+"="*20)


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



Game()