This is a sightly revised version of Michael Dawson's blackjack.py from chapter 9 of Michael Dawson, "Python: Programming for the Absolute Beginner," Third Edition, Course Technology PTR, 2010, Cengage Learning, Boston, ISBN 978-1-4354-5500-9, to avoid problems when run under Python 2.
1 # Blackjack
2 # From 1 to 7 players compete against a dealer
3
4 import cards, games2
5
6 class BJ_Card(cards.Card):
7 """ A Blackjack Card. """
8 ACE_VALUE = 1
9
10 @property
11 def value(self):
12 if self.is_face_up:
13 v = BJ_Card.RANKS.index(self.rank) + 1
14 if v > 10:
15 v = 10
16 else:
17 v = None
18 return v
19
20 class BJ_Deck(cards.Deck):
21 """ A Blackjack Deck. """
22 def populate(self):
23 for suit in BJ_Card.SUITS:
24 for rank in BJ_Card.RANKS:
25 self.cards.append(BJ_Card(rank, suit))
26
27
28 class BJ_Hand(cards.Hand):
29 """ A Blackjack Hand. """
30 def __init__(self, name):
31 super(BJ_Hand, self).__init__()
32 self.name = name
33
34 def __str__(self):
35 rep = self.name + ":\t" + super(BJ_Hand, self).__str__()
36 if self.total:
37 rep += "(" + str(self.total) + ")"
38 return rep
39
40 @property
41 def total(self):
42 # if a card in the hand has value of None, then total is None
43 for card in self.cards:
44 if not card.value:
45 return None
46
47 # add up card values, treat each Ace as 1
48 t = 0
49 for card in self.cards:
50 t += card.value
51
52 # determine if hand contains an Ace
53 contains_ace = False
54 for card in self.cards:
55 if card.value == BJ_Card.ACE_VALUE:
56 contains_ace = True
57
58 # if hand contains Ace and total is low enough, treat Ace as 11
59 if contains_ace and t <= 11:
60 # add only 10 since we've already added 1 for the Ace
61 t += 10
62
63 return t
64
65 def is_busted(self):
66 return self.total > 21
67
68
69 class BJ_Player(BJ_Hand):
70 """ A Blackjack Player. """
71 def is_hitting(self):
72 response = games2.ask_yes_no("\n" + self.name + ", do you want a hit? (Y/N): ")
73 return response == "y"
74
75 def bust(self):
76 print(self.name, "busts.")
77 self.lose()
78
79 def lose(self):
80 print(self.name, "loses.")
81
82 def win(self):
83 print(self.name, "wins.")
84
85 def push(self):
86 print(self.name, "pushes.")
87
88
89 class BJ_Dealer(BJ_Hand):
90 """ A Blackjack Dealer. """
91 def is_hitting(self):
92 return self.total < 17
93
94 def bust(self):
95 print(self.name, "busts.")
96
97 def flip_first_card(self):
98 first_card = self.cards[0]
99 first_card.flip()
100
101
102 class BJ_Game(object):
103 """ A Blackjack Game. """
104 def __init__(self, names):
105 self.players = []
106 for name in names:
107 player = BJ_Player(name)
108 self.players.append(player)
109
110 self.dealer = BJ_Dealer("Dealer")
111
112 self.deck = BJ_Deck()
113 self.deck.populate()
114 self.deck.shuffle()
115
116 @property
117 def still_playing(self):
118 sp = []
119 for player in self.players:
120 if not player.is_busted():
121 sp.append(player)
122 return sp
123
124 def __additional_cards(self, player):
125 while not player.is_busted() and player.is_hitting():
126 self.deck.deal([player])
127 print(player)
128 if player.is_busted():
129 player.bust()
130
131 def play(self):
132 # deal initial 2 cards to everyone
133 self.deck.deal(self.players + [self.dealer], per_hand = 2)
134 self.dealer.flip_first_card() # hide dealer's first card
135 for player in self.players:
136 print(player)
137 print(self.dealer)
138
139 # deal additional cards to players
140 for player in self.players:
141 self.__additional_cards(player)
142
143 self.dealer.flip_first_card() # reveal dealer's first
144
145 if not self.still_playing:
146 # since all players have busted, just show the dealer's hand
147 print(self.dealer)
148 else:
149 # deal additional cards to dealer
150 print(self.dealer)
151 self.__additional_cards(self.dealer)
152
153 if self.dealer.is_busted():
154 # everyone still playing wins
155 for player in self.still_playing:
156 player.win()
157 else:
158 # compare each player still playing to dealer
159 for player in self.still_playing:
160 if player.total > self.dealer.total:
161 player.win()
162 elif player.total < self.dealer.total:
163 player.lose()
164 else:
165 player.push()
166
167 # remove everyone's cards
168 for player in self.players:
169 player.clear()
170 self.dealer.clear()
171
172
173 def main():
174 print("\t\tWelcome to Blackjack!\n")
175
176 names = []
177 number = games2.ask_number("How many players? (1 - 7): ", low = 1, high = 8)
178 for i in range(number):
179 name = raw_input("Enter player name: ")
180 names.append(name)
181 print()
182
183 game = BJ_Game(names)
184
185 again = None
186 while again != "n":
187 game.play()
188 again = games2.ask_yes_no("\nDo you want to play again?: ")
189
190
191 main()
192 raw_input("\n\nPress the enter key to exit.")
193
194
195
196