list index out of range

[Georgy Panterov]

I am a relatively new python user. I am writing an economic simulation of acard-game. The simulation runs fine for a few iteration but then it gives an error of "list index out of range."

The strange thing is that it will sometimes run for 10 iterations sometimesfor only a few and sometimes won't run at all (seemingly arbitrary).
Here is some of the code:

for _ in range(100):
handA=deal_hand (DECK) #deals 2 'hole' cards from a DECK
handB=deal_hand (DECK)
print handA
print handB
deal_flop(handA ,handB,DECK) #appends 3 cards to handA and handB
deal_current(ha ndA,handB,DECK) #appends one more card
deal_rake(handA ,handB,DECK) #appends one more card
DECK.extend(lis t(set(handA+han dB))) #returns the cards to the DECK
print winner(handA,ha ndB) #returns 0-draw 1 -playerA win, 2-playerB win

The error message is :

['08C', '10H']
['07S', '03C']
--------
['06C', '02H']
['04D', '12S']
--------
['11H', '14S']
['06S', '04S']
--------

Traceback (most recent call last):
File "G:\Other Stuff\POKER4.py ", line 267, in <module>
handB=deal_hand (DECK)
File "G:\Other Stuff\POKER4.py ", line 13, in deal_hand
HAND.append(dec k[i])
IndexError: list index out of range

In this case it ran 3 times. It will sometimes run for up to 9-10 times. Itseems to be arbitrary but I can't get it to run more than 12 times.

Here is the code for the --deal_***-- functions:

def deal_hand(deck) :
HAND=[]
for _ in range(2):
i=random.randin t(0,len(deck)) #produces a random card from the deck
HAND.append(dec k[i]) # appends the card to the players' hand list
deck.remove(dec k[i]) #removes the card from the deck
return HAND

def deal_flop(hand1 ,hand2,deck):
for _ in range(3):
i=random.randin t(0,len(deck))

hand1.append(de ck[i])
hand2.append(de ck[i])
deck.remove(dec k[i])

I would appreciate any help with this
Thanks
George


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[inhahe]

Re: list index out of range

random.randint( x,y) returns a random integer between _and including_ x and
y, so randint(0, len(deck)) might return len(deck) and since python's
indices start at 0, the maximum index is len(deck)-1.

rather than using randint(0,len(d eck)-1) you could just do
card = random.choice(d eck)
HAND.append(car d)
deck.remove(car d)

although it would be more efficient to do remove card by index which then
gets us back to using randint, like this

i = random.randint( 0, len(deck)-1)
HAND.append(dec k[i])
del deck[i]

but i guess speed probably isn't a big factor here

also you could have done
i=random.randin t(0, len(deck)-1)
HAND.append(dec k.pop(i))






"Georgy Panterov" <gpanterov@yaho o.comwrote in message
news:mailman.10 68.1210704380.1 2834.python-list@python.org ...
I am a relatively new python user. I am writing an economic simulation of a
card-game. The simulation runs fine for a few iteration but then it gives an
error of "list index out of range."

The strange thing is that it will sometimes run for 10 iterations sometimes
for only a few and sometimes won't run at all (seemingly arbitrary).
Here is some of the code:

for _ in range(100):
handA=deal_hand (DECK) #deals 2 'hole' cards from a DECK
handB=deal_hand (DECK)
print handA
print handB
deal_flop(handA ,handB,DECK) #appends 3 cards to handA and handB
deal_current(ha ndA,handB,DECK) #appends one more card
deal_rake(handA ,handB,DECK) #appends one more card
DECK.extend(lis t(set(handA+han dB))) #returns the cards to the DECK
print winner(handA,ha ndB) #returns 0-draw 1 -playerA win, 2-playerB win

The error message is :

['08C', '10H']
['07S', '03C']
--------
['06C', '02H']
['04D', '12S']
--------
['11H', '14S']
['06S', '04S']
--------

Traceback (most recent call last):
File "G:\Other Stuff\POKER4.py ", line 267, in <module>
handB=deal_hand (DECK)
File "G:\Other Stuff\POKER4.py ", line 13, in deal_hand
HAND.append(dec k[i])
IndexError: list index out of range

In this case it ran 3 times. It will sometimes run for up to 9-10 times. It
seems to be arbitrary but I can't get it to run more than 12 times.

Here is the code for the --deal_***-- functions:

def deal_hand(deck) :
HAND=[]
for _ in range(2):
i=random.randin t(0,len(deck)) #produces a random card from the deck
HAND.append(dec k[i]) # appends the card to the players' hand list
deck.remove(dec k[i]) #removes the card from the deck
return HAND

def deal_flop(hand1 ,hand2,deck):
for _ in range(3):
i=random.randin t(0,len(deck))

hand1.append(de ck[i])
hand2.append(de ck[i])
deck.remove(dec k[i])

I would appreciate any help with this
Thanks
George


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[Mike Kent]

Re: list index out of range

On May 13, 2:39 pm, Georgy Panterov <gpante...@yaho o.comwrote:

>
def deal_hand(deck) :
HAND=[]
for _ in range(2):
i=random.randin t(0,len(deck)) #produces a random card from the deck

^ Here i can be from 0 thru (the number of cards in the
deck).

HAND.append(dec k[i]) # appends the card to the players' hand list

^ Here you index into the deck to get a
card. The legal indexes are 0 thru (number of cards in the deck - 1)
What happens if i is (the number of cards
in the deck)?

deck.remove(dec k[i]) #removes the card from the deck
return HAND
>