Argh! Undead monsters!

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) # Will take first monster in list
        except IndexError: # if list is empty
            return None # None is falsey, but is only ever equal to None (not 0 or False)

    def monster_turn(self):
        # check to see if monster attacks
        if self.monster.attack():
            # if so, tell player
            print("{} attacks you!".format(self.monster))
            # Check to see if player wants to dodge
            if not input("Dodge? Y/n ").lower() == 'n':
            # if so, see if dodge is successful
                if self.player.dodge():
                # if it is, move on
                   print("You dodged the attack.")
                # it it's not, remove one player hit point.
                else:
                    print("You got hit anyway.")
                    self.player.hit_points -= 1
            else:
                print('''{} lunges at you with a powerful "{}!"'''.format(self.monster, self.monster.sound.upper()))
                self.player.hit_points -= 1
        # if monster isn't attacking, tell player
        else:
            print('''The {} roars at you. "{}!" But it's attack misses!'''.format(self.monster, self.monster.sound.upper()))

    def player_turn(self):
        # let player attack, rest, or quit
        action = input("Do you want to [A]ttack, [R]est, or [Q]uit? ").lower()
        # if they attack:
        if action == 'a':
            # see if attack is successful
            print("You attack {} with your {}!".format(self.monster, self.player.weapon))
            if self.player.attack():
                # If so, see if monster dodges
                if self.monster.dodge():
                    # if dodged, print that
                    print("{} dodged your attack!".format(self.monster))
                    # if not dodged, subtract hit points from 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))
            # if attack misses, tell player
            else:
                print("You missed!")

        # if they rest:
        elif action == 'r':
            # Call the player.rest() method
            self.player.rest()
        # if they quit, exit game
        elif action == 'q':
            print("Big baby.")
            sys.exit()
        # if they pick anything else, re-run this method.
        else:
            self.player_turn()

    def cleanup(self):
        if self.monster.hit_points <= 0:
            self.player.experience += self.monster.experience
            print("You have defeated {}!".format(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.monsters or self.monster:
            print("You lose!")
        sys.exit()

Game()