BlackJack Udemy (V4.0) Needs Minor Fixing

############### Blackjack Project #####################

#Difficulty Normal 😎: Use all Hints below to complete the project.
#Difficulty Hard 🤔: Use only Hints 1, 2, 3 to complete the project.
#Difficulty Extra Hard 😭: Only use Hints 1 & 2 to complete the project.
#Difficulty Expert 🤯: Only use Hint 1 to complete the project.

############### Our Blackjack House Rules #####################

## The deck is unlimited in size.
## There are no jokers.
## The Jack/Queen/King all count as 10.
## The the Ace can count as 11 or 1.
## Use the following list as the deck of cards:
## cards = [11, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 10, 10]
## The cards in the list have equal probability of being drawn.
## Cards are not removed from the deck as they are drawn.
## The computer is the dealer.

##################### Hints #####################

#Hint 1: Go to this website and try out the Blackjack game:
#   https://games.washingtonpost.com/games/blackjack/
#Then try out the completed Blackjack project here:
#   http://blackjack-final.appbrewery.repl.run

#Hint 2: Read this breakdown of program requirements:
#   http://listmoz.com/view/6h34DJpvJBFVRlZfJvxF
#Then try to create your own flowchart for the program.

#Hint 3: Download and read this flow chart I've created:
#   https://drive.google.com/uc?export=download&id=1rDkiHCrhaf9eX7u7yjM1qwSuyEk-rPnt

#Hint 4: Create a deal_card() function that uses the List below to *return* a random card.
#11 is the Ace.
import random
import art
import os
cards = [11, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 10, 10]
user_cards = []
computer_cards = []
def clear():
    os.system('cls' if os.name=='nt' else 'clear')

def startgame():
    opinion = input("Do you want to play a game of Black Jack? Type y or n: ")
    if(opinion.lower() == 'y'):
        user_cards.clear()
        computer_cards.clear()
        main()
    else:
        return

def deal_card_user():
    user_cards.append(random.choice(cards))

def deal_card_computer():
     computer_cards.append(random.choice(cards))

    # print(user_cards)


def calculate_score(cardlist):
    result = 0
    result += sum(cardlist)
    if result == 21:
        return 0
    elif result > 21:
        if 11 in cardlist:
            cardlist.remove(11)
            cardlist.append(1)
        return 0
    else:
        return result


def calculate_again(flow):
    user_score = calculate_score(user_cards)
    computer_score = calculate_score(computer_cards)
    game_result = compare(user_score, computer_score, flow)
    if game_result != "":
        print(f"Your final hand : {user_cards}")
        print(f"Computer's final hand {computer_cards}")
        print(game_result)
    else:
        return game_result



def compare(user_score, computer_score, flow):
    if flow == 'n':
        if user_score == computer_score == 0:
            return "It is a draw."
        elif user_score == 0:
            return "You went over. Computer  win"
        elif computer_score == 0:
            return "Computer went over. You win"
        elif user_score > computer_score:
            return "Your score is higher. You win"
        elif user_score < computer_score:
            return "Computer's score is higher. You loss"
    else:
        if(user_score == computer_score == 0):
            return "It is a draw."
        elif user_score == 0:
            return "You went over. Computer  win"
        elif(computer_score == 0):
            return "Computer went over. You win"
        elif user_score > computer_score:
            return "Your score is higher. You win"
        elif user_score < computer_score:
            return "Computer's score is higher. You loss"
        else:
            flow = input("Do you want to draw another card? Type 'y' to draw a card, 'n' to cancel.")
            if(flow.lower() == 'y'):
                deal_card_user()
                game_result = calculate_again()
                if game_result != "":
                    return
            else:
                game_result = calculate_again()
                if game_result != "":
                    return


def main():
    clear()
    print(art.logo)
    deal_card_user()
    deal_card_user()
    deal_card_computer()
    deal_card_computer()
    print(f"Your card: {user_cards}")
    print(f"Computer's first card {computer_cards[0]}")
    flow = input("Type 'y' to get another card, type 'n' to pass: ")
    while flow == 'y':
        deal_card_user()
        game_result = calculate_again(flow)
        if game_result == "":
            print(f"Your card: {user_cards}")
            print(f"Computer's first card {computer_cards[0]}")
            flow = input("Type 'y' to get another card, type 'n' to pass: ")
            calculate_again(flow)
        else:
            startgame()


startgame()




#Hint 5: Deal the user and computer 2 cards each using deal_card() and append().
user_cards = []
computer_cards = []

#Hint 6: Create a function called calculate_score() that takes a List of cards as input
#and returns the score.
#Look up the sum() function to help you do this.



#Hint 7: Inside calculate_score() check for a blackjack (a hand with only 2 cards: ace + 10) and return 0 instead of the actual score. 0 will represent a blackjack in our game.

#Hint 8: Inside calculate_score() check for an 11 (ace). If the score is already over 21, remove the 11 and replace it with a 1. You might need to look up append() and remove().

#Hint 9: Call calculate_score(). If the computer or the user has a blackjack (0) or if the user's score is over 21, then the game ends


#Hint 10: If the game has not ended, ask the user if they want to draw another card. If yes, then use the deal_card() function to add another card to the user_cards List. If no, then the game has ended.

#Hint 11: The score will need to be rechecked with every new card drawn and the checks in Hint 9 need to be repeated until the game ends.

#Hint 12: Once the user is done, it's time to let the computer play. The computer should keep drawing cards as long as it has a score less than 17.

#Hint 13: Create a function called compare() and pass in the user_score and computer_score. If the computer and user both have the same score, then it's a draw. If the computer has a blackjack (0), then the user loses. If the user has a blackjack (0), then the user wins. If the user_score is over 21, then the user loses. If the computer_score is over 21, then the computer loses. If none of the above, then the player with the highest score wins.

#Hint 14: Ask the user if they want to restart the game. If they answer yes, clear the console and start a new game of blackjack and show the logo from art.py.