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cribbage.py
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cribbage.py
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#!/usr/bin/env python
"""
A module containing a collection of methods for scoring a cribbage hand.
"""
import itertools
from card import Suit, Rank, Deck
def score_hand(hand, starter, verbose=False):
"""
Score the hand.
:param hand: a four card hand
:param starter: the starter card
:param verbose: flag for printing
:return: the score of the hand
>>> from card import Card
>>> hand = [Card(Rank.jack, Suit.hearts), \
Card(Rank.five, Suit.spades), \
Card(Rank.five, Suit.clubs), \
Card(Rank.five, Suit.diamonds)]
>>> starter = Card(Rank.five, Suit.hearts)
>>> score_hand(hand, starter, False)
29
"""
p_15 = score_15(hand, starter)
if verbose:
print(" 15s: {:>2}".format(p_15))
p_pair = score_pairs(hand, starter)
if verbose:
print(" pairs: {:>2}".format(p_pair))
p_run = score_runs(hand, starter)
if verbose:
print(" runs: {:>2}".format(p_run))
p_flush = score_flush(hand, starter)
if verbose:
print(" flush: {:>2}".format(p_flush))
p_nibs = score_nibs(hand, starter)
if verbose:
print(" nibs: {:>2}".format(p_nibs))
return p_15 + p_pair + p_run + p_flush + p_nibs
def score_15(hand, starter):
"""
Score hand for 15s.
:param hand: list of cards in hand
:param starter: the starter card
:return: the number of points from 15's
>>> from card import Card
>>> hand = [Card(Rank.jack, Suit.hearts), \
Card(Rank.ace, Suit.spades), \
Card(Rank.two, Suit.clubs), \
Card(Rank.ace, Suit.diamonds)]
>>> starter = Card(Rank.five, Suit.hearts)
>>> score_15(hand, starter)
2
"""
# combine hand and starter
cards = hand[:]
cards.append(starter)
count = 0
# iterate over all combinations of 2, 3, 4, and 5 cards
for l in range(2,6):
for cs in itertools.combinations(cards, l):
# sum up the values of this combination
s = 0
for c in cs:
s += c.get_value()
if s == 15:
# we have a 15
count += 1
# 2 points for each 15
return 2*count
def score_pairs(hand, starter):
"""
Score hand for pairs.
:param hand: list of cards in hand
:param starter: the starter card
:return: the number of points from pairs
Note that 3-of-a-kind is just 3 pairs (6 pts) and a 4-of-a-kind is 6 pairs (12 pts).
>>> from card import Card
>>> hand = [Card(Rank.jack, Suit.hearts), \
Card(Rank.ace, Suit.spades), \
Card(Rank.two, Suit.clubs), \
Card(Rank.ace, Suit.diamonds)]
>>> starter = Card(Rank.five, Suit.hearts)
>>> score_pairs(hand, starter)
2
"""
# combine hand and starter
cards = hand[:]
cards.append(starter)
count = 0
# iterate over all combinations of 2 cards
for cs in itertools.combinations(cards, 2):
if cs[0].rank == cs[1].rank:
# we have a pair
count += 1
# 2 points for each pair
return 2*count
def score_runs(hand, starter):
"""
Score hand for runs.
:param hand: list of cards in hand
:param starter: the starter card
:return: the number of points from runs
5 in a row: A 2 3 4 5 this is a run of 5
0 1 1 1 1
4 in a row: A 2 3 4 6 this has one run of 4
A 2 3 4 A 2 3 6 A 2 4 6 A 3 4 6 2 3 4 6
0 1 1 1 0 1 1 3 0 1 2 2 0 3 1 2 0 1 1 2
3 in a row: A 2 3 3 6 this has two runs of 3
A 2 3 A 2 3 A 2 6 A 3 3 A 3 6 A 3 6 2 3 3 2 3 6 2 3 6 3 3 6
0 1 1 0 1 1 0 1 4 0 2 0 0 2 3 0 4 1 0 1 0 0 1 3 0 1 3 0 0 3
>>> from card import Card
>>> hand = [Card(Rank.jack, Suit.hearts), \
Card(Rank.ten, Suit.spades), \
Card(Rank.nine, Suit.clubs), \
Card(Rank.queen, Suit.diamonds)]
>>> starter = Card(Rank.king, Suit.hearts)
>>> score_runs(hand, starter)
5
>>> starter = Card(Rank.queen, Suit.hearts)
>>> score_runs(hand, starter)
8
>>> starter = Card(Rank.two, Suit.hearts)
>>> score_runs(hand, starter)
4
"""
# combine hand and starter
cards = hand[:]
cards.append(starter)
# first check for a run of 5
scards = sorted(cards)
ds = []
c0 = scards[0]
for c in scards:
d = c.del_rank(c0)
ds.append(d)
c0 = c
# if this matches, we have a run of 5 and can return
if ds == [0, 1, 1, 1, 1]:
return 5
# now check for runs of 4
p = 0
for cs in itertools.combinations(cards, 4):
scards = sorted(cs)
ds = []
c0 = scards[0]
for c in scards:
d = c.del_rank(c0)
ds.append(d)
c0 = c
# if this matches, we have a run of 4
if ds == [0, 1, 1, 1]:
p += 4
# if p is no longer 0, we found runs of 4 and can return
if p > 0:
return p
# finally check for runs of 3
p = 0
for cs in itertools.combinations(cards, 3):
scards = sorted(cs)
ds = []
c0 = scards[0]
for c in scards:
d = c.del_rank(c0)
ds.append(d)
c0 = c
# if this matches, we have a run of 3
if ds == [0, 1, 1]:
p += 3
# here we have runs of 3, or nothing
return p
def score_flush(hand, starter):
"""
Score hand for a flush.
:param hand: list of cards in hand
:param starter: the starter card
:return: the number of points from a flush
- check hand for 4
- check starter for 5
>>> from card import Card
>>> hand = [Card(Rank.jack, Suit.hearts), \
Card(Rank.ace, Suit.hearts), \
Card(Rank.two, Suit.hearts), \
Card(Rank.four, Suit.hearts)]
>>> starter = Card(Rank.five, Suit.hearts)
>>> score_flush(hand, starter)
5
>>> starter = Card(Rank.five, Suit.clubs)
>>> score_flush(hand, starter)
4
"""
cards = hand[:]
# if any pair of the 4 cards have different suits, there is no flush
for cs in itertools.combinations(cards, 2):
if cs[0].get_suit() != cs[1].get_suit():
return 0
# got at least 4, check the starter for 5
if cards[0].get_suit() == starter.get_suit():
return 5
else:
return 4
def score_nibs(hand, starter):
"""
Check hand for his nibs.
:param hand: list of cards in hand
:param starter: the starter card
:return: points for his nibs
>>> from card import Card
>>> hand = [Card(Rank.jack, Suit.hearts), \
Card(Rank.ace, Suit.spades), \
Card(Rank.two, Suit.clubs), \
Card(Rank.ace, Suit.diamonds)]
>>> starter = Card(Rank.five, Suit.hearts)
>>> score_nibs(hand, starter)
1
>>> starter = Card(Rank.five, Suit.diamonds)
>>> score_nibs(hand, starter)
0
"""
for c in hand:
if c.rank.rank == Rank.jack:
if c.suit == starter.suit:
return 1
return 0
if __name__ == '__main__':
import doctest
doctest.testmod()
# Play around
verbose = False
deck = Deck()
n_hands = 1000000
hist = {}
total = 0
mn = 30
mx = -1
for h in range(n_hands):
deck.shuffle()
hand = []
for i in range(4):
hand.append(deck.deal.next())
starter = deck.deal.next()
if verbose:
print("Hand {}: [{}] {} {} {} {}".format(h, starter, *hand))
pts = score_hand(hand, starter, verbose)
if pts in hist:
hist[pts] += 1
else:
hist[pts] = 1
if verbose:
print(" Total: {:>2}".format(pts))
if pts > mx:
mx = pts
if pts < mn:
mn = pts
total += pts
avg = float(total)/n_hands
print("Avg = {:<6} Min = {:<2} Max = {:<2}".format(avg, mn, mx))
for h, p in hist.iteritems():
print("{:>2}: {:>6} [{:>8}]".format(h, p, (100.*p)/n_hands))