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Limnoria/others/poker.py

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###
# Copyright (c) 2004, Jeremiah Fincher
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions, and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions, and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the author of this software nor the name of
# contributors to this software may be used to endorse or promote products
# derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###
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import supybot.fix
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# Constants.
S = 's'
C = 'c'
H = 'h'
D = 'd'
class Rank(int):
def __str__(self):
if 2 <= self <= 10:
return str(self)
elif self == 11:
return 'J'
elif self == 12:
return 'Q'
elif self == 13:
return 'K'
elif self == 14:
return 'A'
elif self == 1:
return 'A'
A = Rank(14)
K = Rank(13)
Q = Rank(12)
J = Rank(11)
class Card(object):
def __init__(self, rank, suit):
self.rank = rank
self.suit = suit
def __str__(self):
return '%s%s' % (self.rank, self.suit)
__repr__ = __str__
def __cmp__(self, other):
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return cmp(self.rank, other.rank)
def combinations(L, n):
if len(L) >= n:
if n == 0:
yield []
else:
(first, rest) = (L[:1], L[1:])
for miniL in combinations(rest, n-1):
yield first + miniL
for miniL in combinations(rest, n):
yield miniL
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def sort(hand):
hand.sort()
hand.reverse()
return hand
def getFlush(hand):
if all(lambda c: c.suit == hand[0].suit, hand):
return sort(hand)
return []
def getStraight(hand):
sort(hand)
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diffs = [x.rank-y.rank for (x,y) in window(hand,2)]
if diffs == [1,1,1,1]:
return hand
elif hand[0].rank == A and diffs == [9,1,1,1]:
ace = hand.pop(0)
hand.append(ace)
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return hand
return []
def getPair(hand):
sort(hand)
for (x, y) in window(hand, 2):
if x.rank == y.rank:
return ([x,y], [c for c in hand if c.rank != x.rank])
return ([], hand)
def getTrips(hand):
sort(hand)
for (x, y, z) in window(hand, 3):
if x.rank == y.rank == z.rank:
return ([x,y,z], [c for c in hand if c.rank != x.rank])
return ([], hand)
def getFours(hand):
sort(hand)
for (x, y, z, w) in window(hand, 4):
if x.rank == y.rank == z.rank == w.rank:
return ([x,y,z,w], [c for c in hand if c.rank != x.rank])
return ([], hand)
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STRAIGHT_FLUSH = '8:straight flush'
FOUR_OF_A_KIND = '7:four of a kind'
FULL_HOUSE = '6:full house'
FLUSH = '5:flush'
STRAIGHT = '4:straight'
THREE_OF_A_KIND = '3:three of a kind'
TWO_PAIR = '2:two pair'
PAIR = '1:pair'
RUNT = '0:runt'
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def score(cards):
"""Returns a comparable value for a list of cards."""
def getRank(hand):
assert len(hand) == 5
(pair, pairRest) = getPair(hand)
if pair:
# Can't be flushes or straights.
(trips, tripRest) = getTrips(hand)
if trips:
(fours, fourRest) = getFours(hand)
if fours:
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return (FOUR_OF_A_KIND, fours + fourRest)
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(pair, _) = getPair(tripRest)
if pair:
# Full house.
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return (FULL_HOUSE, trips + pair)
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sort(tripRest)
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return (THREE_OF_A_KIND, trips + tripRest)
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(otherPair, twoPairRest) = getPair(pairRest)
if otherPair:
if otherPair[0] > pair[0]:
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return (TWO_PAIR, otherPair + pair + twoPairRest)
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else:
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return (TWO_PAIR, pair + otherPair + twoPairRest)
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sort(pairRest)
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return (PAIR, pair + pairRest)
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else:
flush = getFlush(hand)
if flush:
straight = getStraight(hand)
if straight:
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return (STRAIGHT_FLUSH, straight)
return (FLUSH, flush)
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straight = getStraight(hand)
if straight:
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return (STRAIGHT, straight)
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hand.sort()
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return (RUNT, hand)
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first = 0
second = None
for hand in combinations(cards, 5):
(maybeFirst, maybeSecond) = getRank(hand)
if maybeFirst > first:
first = maybeFirst
second = maybeSecond
elif maybeFirst == first:
second = max(second, maybeSecond)
assert len(second) == 5, 'invalid second len'
return (first, second)
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deck = []
for suit in [S, H, C, D]:
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for rank in [A, K, Q, J] + range(10, 1, -1):
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deck.append(Card(rank, suit))
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if __name__ == '__main__':
import random
random.shuffle(deck)
for hand in window(deck, 7):
print '%s: %s' % (hand, score(hand))