grand_blackjack.py

#!/usr/bin/env python

'''
TO DO:
- should try and implement class atributes for the suits of the cards
- keep win/loss stats
'''

'''
command line blackjack game
uses 1 deck with 4 suits which reshuffle when ~5 cards are left
you start with two cards and add them up, if you have 21, then you have a blackjack
dealer is the computer
player plays first, then dealer goes
the better score not exceeding 21 wins
if the dealer and player are equal, then the hand is a tie
any score over 21 is a bust
player starts off with 100 chips to bet
can bet any amount they want at start, but must bet at least 1
if player looses: the bet is taken by the dealer
if player wins: the player wins the amount of the orginal bet
if player wins by with a natural blackjack: the player wins 1.5x the orginal bet
if game ends with tie: player doesn't loose or win any chips
'''
import random

def shufflecards():
	'''
	pick a card from the deck
	a suit of cards in blackjack assumes the values 2 - 10,
	with face cards as 10 and ace as 11 for start
	4 suits in deck, so sequence repeats
	'''
	cards = ['2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K', 'A']
	deck = cards # 1 suit
	deck.extend(deck) # 2 suits
	deck.extend(deck) # 4 suits
	random.shuffle(deck) # shuffles the cards
	return deck

def getbet(chips):
    '''
    player inputs bet amount
    check that the bet is an integer greater of equal to 1
    '''
    while True:
        try:
            bet = int(raw_input("Place your bet: "))
            if bet < 1:
                print "Oops! Bet must be an integer greater or equal to 1."
                continue
            if bet > chips:
                print "You bet more chips than you have. You have %d chips to bet." % (chips)
                continue
            break
        except ValueError:
            print "Oops! Bet must be an integer greater or equal to 1."
    return bet

def inthand(hand):
	hand = [card.replace('A', '11') for card in hand]
	hand = [card.replace('Q', '10') for card in hand]
	hand = [card.replace('J', '10') for card in hand]
	hand = [card.replace('K', '10') for card in hand]
	hand = [int(card) for card in hand]
	return hand

def total(hand): # need to know many aces are in the hand
	'''
	change face value cards to integer values
	the ace can be 11 or 1
	figure out which one it should be based on sum of hand
	'''
	aces = hand.count('A')
	hand = inthand(hand) 
	tot = sum(hand)
	while aces > 0 and tot > 21: 
		# this will switch the Ace from 11 to 1 
		tot = tot - 10
		aces -= 1
	return tot

def testblackjack(hand):
    if len(hand) == 2:
        print "Blackjack!!!"
    return 
    
def printtotal(hand):
    # checks the number of aces and lets you know if you have +/- 10 avilable in the hand
    tot = total(hand) # total of hand
    tot_a = sum(inthand(hand)) # total of hand with all aces as 11
    aces = hand.count('A')
    while aces > 0 and tot_a > tot:
        tot_a = tot_a - 10
        aces -= 1
    if aces == 0:
        print "The player has these cards %s for a total of %d!" % (hand,tot)
    elif aces > 0 and tot <= 20 and tot_a == tot:
        tot_a = tot_a - 10
        print "The player has these cards %s for a total of %d or %d!" % (hand,tot,tot_a)
    elif tot == 21:
        print "The player has these cards %s for a total of %d!" % (hand,tot)
        r = testblackjack(hand)
    return
            
def gethitorstand():
    while True:
        hs = raw_input("Hit or Stand (h or s): ").lower()
        if 'h' in hs or 's' in hs:
            break
        else:
            print "Please type h or s to Hit or Stand"
    return hs
                        
def whowon(dbust, pbust, totp, totd):
	# +1 if player wins
	# -1 if dealer wins
	# 0 if push
	if pbust:
		print "The player busts. The dealer wins!"
		result = -1
	elif dbust:
		print "The dealer busts. The player wins!"
		result = 1
	else:
		if totd > totp:
			print "The dealer wins!"
			result = -1
		if totp > totd:
			print "The player wins!"
			result = 1
		if totd == totp:
			print "It's a draw!"
			result = 0
	return result

def main():
	while True: # begins the game
		print "Welcome to Blackjack!"
		pchips = 100 # player starting amount of chips # set up the deck
		deck = shufflecards() # shuffle the deck at the start of every new game
		cardnum = 0 # intialize start of deck
		while True: 
			# begins every new match
			pbust = False  # player busted flag
			dbust = False  # computer busted flag
			pwin = False # player win flag
			dwin = False # dealer win flag # Player bets to play
			print  "You have %d chips to bet" % (pchips) # get the bet from the player
			bet = getbet(pchips) 
			# set up the hand
			pcards=[]
			dcards = []
			if cardnum >= 47: 
				# reshuffle when ~5 cards are left
				print "Shuffling the deck"
				deck = shufflecards() # shuffle the deck
				cardnum = 0 
			# re-intialize start of deck
			pcards.append(deck[cardnum])
			dcards.append(deck[cardnum+1])
			pcards.append(deck[cardnum+2])
			dcards.append(deck[cardnum+3])
			cardnum=cardnum+4
			print "The dealer shows a %s." % (dcards[0])
			# player goes first
			while True:
				totp = total(pcards)
				printtotal(pcards)
				if totp > 21:
					pbust = True
					break
				elif totp < 21: 
					# get hit or stand
					hs = gethitorstand()
					if 'h' in hs:
						pcards.append(deck[cardnum])
						cardnum += 1 # increase to take the next card
					elif 's' in hs:
						break
				if totp == 21:
					break 
			# dealer's turn
			totd=0
			if not pbust: # dealer only goes if player didn't bust
				while True:  
					# dealer hits until his hand value is 17 or greater
					totd = total(dcards)
					while totd <= 16:
						dcards.append(deck[cardnum])
						totd = total(dcards)
						cardnum += 1
					if totd > 21:
						print "The dealer has these cards %s for a total of %d!" % (dcards,totd)
						dbust = True
						break
					if totd >= 17 and totd < 21:
						print "The dealer has these cards %s for a total of %d!" % (dcards,totd)
						break
					if totd == 21:
						print "The dealer has these cards %s for a total of %d!" % (dcards,totd)
						if len(dcards)==2:
							print "Dealer has blackjack!"
						break

			# Who won?
			result = whowon(dbust, pbust, totp, totd) # Award the bet
			if result == 1 and len(pcards)==2 and totp == 21: 
				# award more points for natural BlackJack
				pchips = pchips + 1.5*bet
				print pchips
			else:
				pchips = pchips + result*bet
			# Play again?
			if pchips > 0:
				print "Player has %d chips left! Do you want to continue?" % (pchips)
				exit = raw_input("Press Enter to Continue (q to quit): ").lower()
			else:
				print "Player doesn't have any chips left!"
				exit = "q"
			if 'q' in exit:
				break
		break
	totbet = pchips - 100
	if totbet > 0:
		print "Player ended with %d chips. That's %d more than player began with! Congrats! Thanks for playing!" % (pchips,totbet)
	else:
		print "Player ended with %d chips. Thanks for playing!" % (pchips)    

if __name__ == "__main__":  
	main()