blackjack.py

gistfile1.py

from random import *
from math import *

#GLOBAL VARIABLES

cards = range(0,52)

def randRange(in_lower, in_upper):
    temp_range = in_upper - in_lower
    return int(round((temp_range+0.5)*random() + (in_lower - 0.5)))

def cardAsString(in_card):
    value = ["ace","two","three","four","five","six","seven","eight","nine","ten","jack","queen","king"]
    suit = ["hearts","diamonds","spades","clubs"]
    return value[in_card % 13]+ " of " + suit[in_card / 13]

def popRandArray(in_list):
    return in_list.pop(randRange(0, len(in_list) - 1))

def realDealCard():
    global cards
    if len(cards)==0:
        print "new deck"
        cards = range(0, 52)
    return popRandArray(cards)

def cardScore(in_card):
    score = in_card % 13 + 1
    if score > 10:
        score = 10
    return score

def calculate_score(cards):
    score = 0
    first_ace = False
    for card in cards:
        card_score = cardScore(card)
        if card_score == 1 and first_ace == False: # first ace can be 1 or 11
            first_ace = True
            # skip first ace now
        else:
            score += card_score
    if first_ace == True:
        # if score + ace <= 21 then first ace can be 11, otherwise it's 1.
        if score + 11 <= 21:
            score += 11
        else:
            score += 1
    return score

def do_dealer_turn(cards):
    current_score = calculate_score(cards)
    # dealer takes one more card if score is < 17
    if current_score < 17:
        return realDealCard()
    else:
        return None
    
def do_player_turn(cards):
    current_score = calculate_score(cards)
    print 'Your current score is', current_score
    if current_score >= 21:
        return None
    if len(cards) >= 2:
        more = raw_input('Should I give you one more card? (yes/no) ')
        if more == 'no':
            return None
        if more != 'yes':
            print "Neither 'no' nor 'yes' means 'yes'!"
    
    # give user first 2 cards without user interaction
    card = realDealCard()
    print "Dealer gives you", cardAsString(card)
    return card

def play_single_set():
    dealer_cards = []
    player_cards = []
    
    player_continue = True
    dealer_continue = True

    while player_continue or dealer_continue:
        if dealer_continue:
            card = do_dealer_turn(dealer_cards)
            if card != None:
                dealer_cards.append(card)
            else:
                dealer_continue = False
                
        if player_continue:
            card = do_player_turn(player_cards)
            if card != None:
                player_cards.append(card)
            else:
                player_continue = False
    
    player_score = calculate_score(player_cards)
    dealer_score = calculate_score(dealer_cards)
    print "Player score:", player_score, "Dealer score:", dealer_score
    print "Dealer has the following cards:"
    for card in dealer_cards:
        print cardAsString(card)

    # "rank" is a way to compare scores
    # if player has score > 21 (loser), then let rank = 0
    # else let rank = score
    if player_score > 21:
        player_rank = 0
    else:
        player_rank = player_score
    
    if dealer_score > 21:
        dealer_rank = 0
    else:
        dealer_rank = dealer_score
    
    # after this transform, the better rank means the better cards.
    if player_rank == dealer_rank:
        print "Draw"
    elif player_rank > dealer_rank:
        if player_rank == 21:
            print "Wow! Black jack! You win with black jack!"
        else:
            print "You win!"
    else:
        print "You lose!"

def game():
    sets = int(raw_input('how many sets do you want to play? '))
    for i in range(sets): # for (i<0; i<sets; i++)
        play_single_set()

if __name__ == "__main__":
    game()