COSI 10A  Video Draw Poker

COSI 10A 
Video Draw Poker
This programming assignment combines advanced list operations, complex logic, and creation and use
of dictionaries. The goal is to build a video poker game as one might find at a casino or app store.
Starting with a balance of $100, in a while loop while the balance > 0, you ask the user for a bet. The
bet has to be <= the current balance, but a bet of 0 ends the game.
Next, you create a new deck of 52 cards in random order, and deal a hand of 5 cards, drawing cards in
order from the deck using list.pop(0). Newdeck and deal should be separate functions.
I supply Printcard(card) which uses Unicode characters to print the suits. You write
Printhand(hand) which goes thru the 5 cards, printing cards, or 2 spaces if the card is negative.
Next engage in select(hand) which is a discard loop where the user decides to keep or throw
his/her cards (using keys 1-5) then enters 0 to draw new replacement cards from the deck. When the
user picks 3, for example, set the third card to – the third card, which will make it “disappear” when
Printhand is executed again, unless the user changes her mind and picks 3 again.
(Note that in casino videopoker, the user selects the cards to hold while for ease of implementation we
are selecting the cards to throw away.)
After the user is done discarding, she enters 0, and you replace the negative cards with new cards
drawn from the deck. This is called drawing.
Finally, using the included function rate RATE and 2 dictionaries, tell the user what hand they got and
their new balance, which is balance + bet * payoff,. then loop back to get the next bet.
Each phase should be written as a separate function to help manage complexity of the main function.
This figure shows a likely arrangement of subfunctions:
NEWDECK can use a nested loop or a list comprehension to generate 52 numbers 1.1, 1.2, 1.3, 1.4,
2.1…13.4. (each card is face value 1-13 plus suit/10.) Use random.shuffle to mix the cards.
Getbet(stake, prevbet) should allow user to bet the previous amount by inputting an empty
string. Betting 0 should end the game, so you need to be crafty about testing the new bet and breaking
out of the main while loop. Betting less than 0 or more than their balance should generate an out of
range error and ask again. Betting their full balance should print out “Risky!”
I include model code for some of the more esoteric parts of this programming assignment. Constant
SUITS sets up Unicode characters for the 4 suit symbols. PRINTCARD prints out one card using
string indexing, and FRAC gets the fractional part of a card as an integer.
RATE is so complex that I wrote it myself. It turns a hand into a number, increasing with the rarity of a
hand. As in most video poker games, only jacks or better counts for a pair, and a royal flush is
considered higher than straight flush. Here's what the numbers returned by rate actually mean:
1 Busted
2 Jacks or Better pair
4 Two Pair
8 Three of a kind
9 Straight
10 Flush
16 Full House
64 Four of a kind
90 Straight Flush
110 Royal Flush
You will turn this into a dictionary and look up the result of RATE to get the name of the hand.
You will build a second dictionary just of numbers, which are the payouts for when the player gets a
particular hand. The only constraint is that Busted should lose their bet and when they win it adds
some multiple of bet to their balance. Here are the numbers I used:
.
1 -1
2 1
4 2
8 4
9 6
10 8
16 15
64 25
90 40
110 50
Here is a trace of my game play showing a few different bets
You have 100. whats your bet (0 to quit)?[10]25
3♦ 5♦ 9♣ 9♠ 3♠ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!2
3♦ 9♣ 9♠ 3♠ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!0
3♦ 4♥ 9♣ 9♠ 3♠ Your hand is Two Pair
You win 50
You have 150. whats your bet (0 to quit)?[25]
K♦ K♠ K♥ 8♠ 3♦ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!4
K♦ K♠ K♥ 3♦ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!5
K♦ K♠ K♥ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!0
K♦ K♠ K♥ 6♥ 9♠ Your hand is Three of a Kind
You win 100
You have 250. whats your bet (0 to quit)?[25]500
You don't have that much!
You have 250. whats your bet (0 to quit)?[25]50
2♠ A♣ 3♦ 4♣ 4♦ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!5
2♠ A♣ 3♦ 4♣ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!0
2♠ A♣ 3♦ 4♣ T♣ Your hand is Busted
You win -50
You have 200. whats your bet (0 to quit)?[50]
J♠ A♣ 8♥ 3♠ Q♠ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!3
J♠ A♣ 3♠ Q♠ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!4
J♠ A♣ Q♠ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!5
J♠ A♣ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!0
J♠ A♣ 9♦ 7♠ T♠ Your hand is Busted
You win -50
You have 150. whats your bet (0 to quit)?[50]150
Risky!
9♦ 8♠ 3♣ 5♠ 8♣ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!1
 8♠ 3♣ 5♠ 8♣ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!3
 8♠ 5♠ 8♣ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!4
 8♠ 8♣ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!0
2♠ 8♠ 2♣ 3♠ 8♣ Your hand is Two Pair
You win 300
You have 450. whats your bet (0 to quit)?[150]450
Risky!
Q♠ A♠ 9♥ 7♦ T♦ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!3
Q♠ A♠ 7♦ T♦ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!4
Q♠ A♠ T♦ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!5
Q♠ A♠ Enter 1 thru 5 to discard (or recover) a card, 0 to draw!0
Q♠ A♠ 4♦ 2♦ 6♥ Your hand is Busted
You win -450
Thank you for playing. You are exiting with $ 0
Here is the given code:
SUITS=u'\u2660'+u'\u2665'+u'\u2666'+u'\u2663'
def printcard(card):
 print('A23456789TJQK'[int(card)-1],SUITS[frac(card)-1],sep='',end=' ')
def frac(card):
 return round(card %1 * 10)
def rate(hand): #sort and rate a poker hand
 shand=sorted(hand)
 i,j,prod = 0,1,1
 while j < 5:
 if int(shand[i]) == int(shand[j]):
 prod=prod*2**(j-i)
 c=int(shand[j]) #what card made the 2,3,4 of a kind
 else:
 i=j
 j+=1
 if prod == 1: #check for strait and flush and high strait
 d,f,e = 9,10,11
 for i in range(1,5):
 d = 1 if int(shand[i]) != int(shand[i-1])+1 else d
 e = 1 if int(shand[i]) != 8+i+int(shand[0]) else e
 f = 1 if frac(shand[0]) != frac(shand[i]) else f
 prod=d*e*f
 prod = 9 if prod == 11 else prod # there aint no high strait
 prod = 1 if prod == 2 and 1 < c < 11 else prod #jacks or better
 return prod