First Python Project: Blackjack

The rules for Blackjack

 

• If the total value of your cards exceeds 21, you lose (Bust).
• Jacks, Queens, and Kings are each valued at 10, and Aces can be valued as either 1 or 11, depending on which value is more advantageous.
• At the start, the dealer receives two cards, and the player also receives two cards.
• One of the dealer's cards is face-up, and the other card is face-down.
• To win, the player's total card value must be greater than the dealer's total card value but not exceed 21.
• The player may choose to receive additional cards if desired.
• If the dealer's total card value is 16 or less, the dealer must draw an additional card.

My first code

# 블랙잭 게임 프로젝트 with 파이썬
import random

# 카드, 사용자, 컴퓨터 리스트 정렬
cards = [11, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 10]
user = []
computer = []

# 랜덤으로 카드를 불러오는 함수
def get_card():
    
    card = random.choice(cards)
    return card

    
# 승패를 결정하는 함수
def compare():
    
    user_point = sum(user)
    computer_point = sum(computer)
    
    print(f"Your final hand: {user}, final score: {user_point}")
    print(f"Computer's final hand: {computer}, final score: {computer_point}")
    
    if user_point > 21:
        print("You went over 21. You lose!")
    elif computer_point > 21:
        print("Computer went over 21. You win!")
    elif user_point > computer_point:
        print("You win!")
    elif user_point == computer_point:
        print("It's a draw!")
    else:
        print("You lose!")
        
        

print("##############   Start Blackjack Game   ##############")

# 첫번째 카드 분배
user.append(get_card())
computer.append(get_card())
print(f"computer card is {computer}")

# 두번째 카드 분재(여기서부터 컴퓨터 카드는 비공개)
user.append(get_card())
computer.append(get_card())
print(f"Your cards are {user}")


# 사용자가 카드를 더 받을지 선택
more = input("Do you want a card? Choose yes or no: ")
while True:
    if more == "yes":
        user.append(get_card())
        print(f"Your cards are {user}")
        if sum(user) > 21:
            print("You went over 21. You lose!")
            break
    elif more == "no":
        break
    else:
        print("Invalid input. Please choose 'yes' or 'no'.")
    
    more = input("Do you want a card? Choose yes or no: ")
    compare()


# 컴퓨터가 17 미만의 카드 합인 경우
if sum(computer) < 17:
    computer.append(get_card())

 

 

I created a simple Blackjack game using Python for the first time.

 

As you know if you read my code I failed to apply one rule to the code.  

 

Rules I failed to apply: : 'Aces can be worth either 1 or 11, depending on which value is better.' 

 

I reviewed the course materials from the teacher who assigned the project and identified the missing parts and the sections I couldn't implement.

Good code

import random
import os

def deal_card():
  """Returns a random card from the deck."""
  cards = [11, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 10, 10]
  card = random.choice(cards)
  return card

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 11 in cards and sum(cards) > 21:
    cards.remove(11)
    cards.append(1)
  return sum(cards)

def compare(user_score, computer_score):
  if user_score > 21 and computer_score > 21:
    return "You went over. You lose 😤"
  if user_score == computer_score:
    return "Draw 🙃"
  elif computer_score == 0:
    return "Lose, opponent has Blackjack 😱"
  elif user_score == 0:
    return "Win with a Blackjack 😎"
  elif user_score > 21:
    return "You went over. You lose 😭"
  elif computer_score > 21:
    return "Opponent went over. You win 😁"
  elif user_score > computer_score:
    return "You win 😃"
  else:
    return "You lose 😤"

def play_game():

  print("----------Start Game----------")
  user_cards = []
  computer_cards = []
  is_game_over = False

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

  while not is_game_over:
    user_score = calculate_score(user_cards)
    computer_score = calculate_score(computer_cards)
    print(f"   Your cards: {user_cards}, current score: {user_score}")
    print(f"   Computer's first card: {computer_cards[0]}")

    if user_score == 0 or computer_score == 0 or user_score > 21:
      is_game_over = True
    else:
      user_should_deal = input("Type 'y' to get another card, type 'n' to pass: ")
      if user_should_deal == "y":
        user_cards.append(deal_card())
      else:
        is_game_over = True

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

  print(f"   Your final hand: {user_cards}, final score: {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":
  os.system('cls')
  play_game()

a problem with my code
1. The code is dirty.
2. I misunderstood the rules of the game, so I didn't include Blackjack.
3. I didn't include code to ask if the user would like to play the game again

I knew that analysis of requirements was important in university lectures.
However, I did not follow the requirements of this project well.
Through direct experience, I was able to realize how important it is to analyze requirements before coding.

I believe my coding skill will be better!!