Задача по Python Блек-джек

import random
 
class Card:
    def __init__(self, rank, suit):
        self.rank = rank
        self.suit = suit
        
    def get_value(self):
        if self.rank in ['J', 'Q', 'K']:
            return 10
        elif self.rank == 'A':
            return 11
        else:
            return int(self.rank)
    
    def __str__(self):
        return self.rank + " of " + self.suit
 
class Deck:
    def __init__(self):
        ranks = ['2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K', 'A']
        suits = ['Clubs', 'Diamonds', 'Hearts', 'Spades']
        self.cards = [Card(rank, suit) for rank in ranks for suit in suits]
        
    def shuffle(self):
        random.shuffle(self.cards)
        
    def draw(self):
        if len(self.cards) > 0:
            return self.cards.pop()
        else:
            return None
        
    def __str__(self):
        s = ""
        for i in range(len(self.cards)):
            s += " " * i + str(self.cards[i]) + "\n"
        return s
 
class Player:
    def __init__(self, name):
        self.name = name
        self.hand = []
    
    def draw(self, deck):
        self.hand.append(deck.draw())
        return self
    
    def calculate_hand_value(self):
        value = sum([card.get_value() for card in self.hand])
        if value > 21:
            for card in self.hand:
                if card.get_value() == 11:
                    value -= 10
                    if value <= 21:
                        break
        return value
    
    def __str__(self):
        s = "Player: " + self.name + "\n"
        for card in self.hand:
            s += str(card) + "\n"
        s += "Hand value: " + str(self.calculate_hand_value())
        return s
 
# Create a deck
deck = Deck()
 
# Shuffle the deck
deck.shuffle()
 
# Create a player
player = Player("Kostya")
 
# Draw initial cards
player.draw(deck).draw(deck)
 
# Create a computer player
computer = Player("Computer")
 
# Draw initial cards
computer.draw(deck).draw(deck)
 
print(player)
 
while True:
    user_choice = input("Do you want to draw a card? (y/n)")
    if user_choice == 'y':
        player.draw(deck)
        print(player)
        if player.calculate_hand_value() > 21:
            print("Bust! You lose.")
            break
    else:
        while computer.calculate_hand_value() < 17:
            computer.draw(deck)
        print(computer)
        player_value = player.calculate_hand_value
        computer_value = computer.calculate_hand_value()
        if player_value > 21:
            print("Bust! You lose.")
        elif computer_value > 21:
            print("Computer busts! You win.")
        elif player_value > computer_value:
            print("You win!")
        elif player_value < computer_value:
            print("You lose.")
        else:
            print("It's a tie.")
        break