blackjack.py

import random
import os


## Resources
# Code is from and inspired by with some improvements:
# 100 Days of Code: The Complete Python Pro Bootcamp
# https://www.udemy.com/share/103J8C3@0R0_ZWb7kJ4do0X-4zRsulmwTyefJndLSF7-DCQhp_3ojIbfiWmdBIvIMOalNv_ECg==/


ACE = 11
FACE_CARD = 10
cards = [ACE, 2, 3, 4, 5, 6, 7, 8, 9, 10, FACE_CARD, FACE_CARD, FACE_CARD]
user_buyin_balance = 0
user_bid_amount = 0


def clear_screen():
    """Clears the terminal screen."""
    os.system("cls" if os.name == "nt" else "clear")


def draw_card():
    """Returns a random card from the deck."""
    return random.choice(cards)


def calculate_score(cards):
    """Take a list of cards and return the score calculated from the cards."""
    if sum(cards) == 21 and len(cards) == 2:
        return 0
    if ACE in cards and sum(cards) > 21:
        cards.remove(ACE)
        cards.append(1)
    return sum(cards)


def compare(user_score, computer_score):
    global user_buyin_balance, user_bid_amount

    if user_score > 21 and computer_score > 21:
        user_buyin_balance -= user_bid_amount
        return "You went over. You lose"
    if user_score == computer_score:
        return "Draw"
    elif computer_score == 0:
        user_buyin_balance -= user_bid_amount
        return "Lose, opponent has BlackJack"
    elif user_score == 0:
        user_buyin_balance += user_bid_amount
        return "Win with a BlackJack"
    elif user_score > 21:
        user_buyin_balance -= user_bid_amount
        return "You went over. You lose"
    elif computer_score > 21:
        user_buyin_balance += user_bid_amount
        return "Opponent went over. You win"
    elif user_score > computer_score:
        user_buyin_balance += user_bid_amount
        return "You win"
    else:
        user_buyin_balance -= user_bid_amount
        return "You lose" 


def display_hand(cards, score):
    print(f"Your cards: {cards}, current score: {score}")


def play_game():
    global user_buyin_balance, user_bid_amount
    clear_screen()
    print("Welcome to BlackJack!")
    print(f"Your current remaining buyin balance is: ${user_buyin_balance}")
    buyin_amount = int(input("How much would would you like to buyin? $"))
    user_buyin_balance += buyin_amount
    bid_amount = int(input("How much would you like to bid? $"))
    user_bid_amount = bid_amount

    user_cards = []
    computer_cards = []

    for _ in range(2):
        user_cards.append(draw_card())
        computer_cards.append(draw_card())

    while True:
        user_score = calculate_score(user_cards)
        computer_score = calculate_score(computer_cards)
        display_hand(user_cards, user_score)
        print(f"Computer's first card: {computer_cards[0]}")

        if user_score == 0 or computer_score == 0 or user_score > 21:
            break

        user_should_deal = input("Type 'y' to get another card, 'n' to pass: ")
        if user_should_deal.lower() == 'y':
            user_cards.append(draw_card())
        else:
            break

    while computer_score != 0 and computer_score < 17:
        computer_cards.append(draw_card())
        computer_score = calculate_score(computer_cards)

    display_hand(user_cards, user_score)
    print(f"Computer's final hand: {computer_cards}, final score: {computer_score}")
    print(compare(user_score, computer_score))


while input("Do you want to play a game of BlackJack? Type 'y' or 'n': ") == 'y':
    play_game()


print(f"Your cash out balance is: ${user_buyin_balance:,.2f}")