Ygthkb

I'm an absolute python beginner.

I created a draw poker game that works fine up to about ten thousand hands, at which point it starts to freeze and not generate the hands. Given that straight flushes only generate about once per 70 thousand hands (it may be more common bc my program uses multiple decks for the many hands) and royal flushes once per >600k, I'd like to be able to generate more hands. Is there something in my code that's taking up tons of memory or slowing the process down?

Here's my current code:

import copy

import distutils.core

from random import randint

from math import floor



#Individual Cards

class Card:

    def __init__ (self,value,suit):

        self.value = value

        self.suit = suit

        self.vname = ''

        self.sname = ''



    def valname(self, value):

        if self.value == 2:

            self.vname = 'Two'

            return 'Two'

        if self.value == 3:

            self.vname = 'Three'

            return 'Three'

        if self.value == 4:

            self.vname = 'Four'

            return'Four'

        if self.value == 5:

            self.vname = 'Five'

            return'Five'

        if self.value == 6:

            self.vname = 'Six'

            return'Six'

        if self.value == 7:

            self.vname = 'Seven'

            return'Seven'

        if self.value == 8:

            self.vname = 'Eight'

            return'Eight'

        if self.value == 9:

            self.vname = 'Nine'

            return'Nine'

        if self.value == 10:

            self.vname = 'Ten'

            return'Ten'

        if self.value == 11:

            self.vname = 'Jack'

            return'Jack'

        if self.value == 12:

            self.vname = 'Queen'

            return'Queen'

        if self.value == 13:

            self.vname = 'King'

            return'King'

        if self.value == 14:

            self.vname = 'Ace'

            return'Ace'



    def suitname(self, suit):

        if self.suit == "hearts":

            self.sname = '♥'

            return '♥'

        if self.suit == "spades":

            self.sname = '♠'

            return '♠'

        if self.suit == "clubs":

            self.sname = '♣'

            return '♣'

        if self.suit == "diamonds":

            self.sname = '♦'

            return '♦'



    def cardname(self):

        return f'{self.sname}{self.vname}{self.sname}'



#All Decks

class Deck:

    def __init__(self):

        self.cards = []

        self.create()



    def create(self):

        for d in range(decks):

            for suit in ["hearts", "spades", "clubs", "diamonds"]:

                for val in [2,3,4,5,6,7,8,9,10,11,12,13,14]:

                    self.cards.append(Card(val,suit)); d+=1



    def shuffle(self):

        for _ in range(26):

            for index in range(len(self.cards)-1,-1,-1):

                rindex = randint(0, index)

                self.cards[index], self.cards[rindex] = self.cards[rindex], self.cards[index]



    def draw(self):

        c1 = self.cards.pop()

        c2 = self.cards.pop()

        c3 = self.cards.pop()

        c4 = self.cards.pop()

        c5 = self.cards.pop()

        return [c1,c2,c3,c4,c5]



def ss():

    if show_strength: print(f'[{round(strength/10000,6)}]')



#Evaluation Functions

def evalname(x):

    if x == 2:

        return 'Two'

    if x == 3:

        return 'Three'

    if x == 4:

        return 'Four'

    if x == 5:

        return 'Five'

    if x == 6:

        return 'Six'

    if x == 7:

        return 'Seven'

    if x == 8:

        return 'Eight'

    if x == 9:

        return 'Nine'

    if x == 10:

        return 'Ten'

    if x == 11:

        return 'Jack'

    if x == 12:

        return 'Queen'

    if x == 13:

        return 'King'

    if x == 14:

        return 'Ace'



def hcard(hand):

    global strength

    strength = 1000 + 10*vsort[0] + vsort[1] + .1*vsort[2] + .01*vsort[3] + .001*vsort[4]

    return f'High-Card {evalname(vsort[0])}'



def numpair(hand):

    global strength

    pairs = list(dict.fromkeys([val for val in values if values.count(val) == 2]))

    if len(pairs) < 1:

        return False

    if len(pairs) == 1:

        vp = vsort.copy()

        for _ in range(2):

            vp.remove(pairs[0])

        strength = 2000 + 10*pairs[0] + vp[0] + .1*vp[1] + .01*vp[2];

        return f'Pair of {evalname(pairs[0])}s'

    if len(pairs) == 2:

        vps = vsort.copy()

        for _ in range(2):

            vps.remove(pairs[0]); vps.remove(pairs[1])

        if pairs[0]>pairs[1]:

            strength = (3000 + 10*int(pairs[0]) + int(pairs[1])) + .1*vps[0]

            return f'{evalname(pairs[0])}s and {evalname(pairs[1])}s'

        else:

            strength = (3000 + 10*int(pairs[1]) + int(pairs[0])) + .1*vps[0]

            return f'{evalname(pairs[1])}s and {evalname(pairs[0])}s'





def detset(hand):

    global strength

    detsets = [val for val in values if values.count(val) == 3]

    if len(detsets) < 1:

        return False

    else:

        vs = vsort.copy()

        for _ in range(3):

            vs.remove(detsets[0])

        strength = 4000 + 10*detsets[0] + vs[0] + .1*vs[1]

        return f'Set of {evalname(detsets[0])}s'



def straight(hand):

    global strength

    if (max(vset) - min(vset) == 4) and numpair(hand) == False and detset(hand) == False and quads(hand) == False:

        strength = 4999 + min(vset)

        straight = f'Straight from {evalname(min(vset))} to {evalname(max(vset))}'

    elif vset == {14,2,3,4,5}:

        strength = 5000

        straight = 'Straight from Ace to Five'

    else:

        straight = False

    return straight



def flush(hand):

    global strength

    suits = [hand[0].suit,hand[1].suit,hand[2].suit,hand[3].suit,hand[4].suit]

    flushes = [suit for suit in suits if suits.count(suit) == 5]

    if len(flushes) < 5:

        flush = False

    else:

        values.sort(reverse=True)

        strength = 6000 + 10*values[0] + values[1] + .1*values[2] + .01*values[3] + .001*values[4]

        flush = f'{evalname(max(values))}-High flush of {flushes[0]}'

    return flush



def fullhouse(hand):

    global strength

    pairs = [val for val in values if values.count(val) == 2]

    detsets = [val for val in values if values.count(val) == 3]

    if detset(hand) != False and numpair(hand) != False:

        strength = 7000 + 10*detsets[0] + pairs[0]

        fh = f'{evalname(detsets[0])}s full of {evalname(pairs[0])}s'

    else:

        fh = False

    return fh



def quads(hand):

    global strength

    quads = [val for val in values if values.count(val) == 4]

    if len(quads) < 1:

        return False

    else:

        vq = vsort.copy()

        for _ in range(4):

            vq.remove(quads[0])

        strength = 8000 + 10*quads[0] + vq[0]

        return f'Quad {evalname(quads[0])}s'



def straightflush(hand):

    global strength

    if (max(vset) - min(vset) == 4) and numpair(hand) == False and detset(hand) == False and quads(hand) == False and vset != {14,13,12,11,10}:

        straight = "True"

    elif vset == {14,2,3,4,5}:

        straight = 'Wheel'

    elif vset == {14,13,12,11,10}:

        straight = "Royal"

    else:

        straight = 'False'



    flushes = [suit for suit in suits if suits.count(suit) == 5]

    if len(flushes) < 1:

        flush = False

    else:

        flush = True



    if straight == "True" and flush == True:

        strength = 8999 + min(vset)

        sf = f'{evalname(max(values))}-high straight flush of {flushes[0]}'

    elif straight == "Wheel" and flush == True:

        strength = 9000

        sf = f'Five-High straight flush of {flushes[0]}'

    elif straight == "Royal" and flush == True:

        strength = 10000

        sf = f'Royal flush of {flushes[0]}'

    else:

        sf = False

    return sf



#Count Hand Occurence

hand_occurence = {0:0,1:0,2:0,3:0,4:0,5:0,6:0,7:0,8:0,9:0}

ho_names = ['High Card: ','Pair: ','Two-Pair: ','Three of a Kind: ','Straight: ','Flush: ','Full House: ','Four of a Kind: ','Straight Flush: ','Royal Flush: ']



decks = int(input("How many decks are there? "))

deck = Deck(); deck.shuffle()



hnumber = int(input(f"How many players are there (max {floor((decks*52)/5)})? "))

show_strength = distutils.util.strtobool(input("Would you like to show advanced stats? "))

h_inc = 0; h_strength = {}



while h_inc < hnumber:

    print(f"nPlayer {h_inc + 1}'s hand:")

    c1,c2,c3,c4,c5 = deck.draw(); hand = c1,c2,c3,c4,c5

    values = [hand[0].value,hand[1].value,hand[2].value,hand[3].value,hand[4].value]; vset = {hand[0].value,hand[1].value,hand[2].value,hand[3].value,hand[4].value}; vsort = sorted(values,reverse=True)

    suits = [hand[0].suit,hand[1].suit,hand[2].suit,hand[3].suit,hand[4].suit]

    c1.valname(c1.value); c2.valname(c2.value); c3.valname(c3.value); c4.valname(c4.value); c5.valname(c5.value);

    c1.suitname(c1.suit); c2.suitname(c2.suit); c3.suitname(c3.suit); c4.suitname(c4.suit); c5.suitname(c5.suit);

    print(f'| {c1.cardname()} | {c2.cardname()} | {c3.cardname()} | {c4.cardname()} | {c5.cardname()} |')



    hcard(hand); numpair(hand); detset(hand); straight(hand); flush(hand); fullhouse(hand); quads(hand); straightflush(hand)

    if strength < 2000:

        print(hcard(hand),end=" "); ss()

        hand_occurence[0]+=1

    elif strength < 3000:

        print(numpair(hand),end=" "); ss()

        hand_occurence[1]+=1

    elif strength < 4000:

        print(numpair(hand),end=" "); ss()

        hand_occurence[2]+=1

    elif strength < 5000:

        print(detset(hand),end=" "); ss()

        hand_occurence[3]+=1

    elif strength < 6000:

        print(straight(hand),end=" "); ss()

        hand_occurence[4]+=1

    elif strength < 7000:

        print(flush(hand),end=" "); ss()

        hand_occurence[5]+=1

    elif strength < 8000:

        print(fullhouse(hand),end=" "); ss()

        hand_occurence[6]+=1

    elif strength < 9000:

        print(quads(hand),end=" "); ss()

        hand_occurence[7]+=1

    elif strength < 10000:

        print(straightflush(hand),end=" "); ss()

        hand_occurence[8]+=1

    elif strength == 10000:

        print(straightflush(hand),end=" "); ss()

        hand_occurence[9]+=1



    h_strength[h_inc] = strength



    h_inc += 1



hss = sorted(h_strength.items(), key=lambda k: k[1], reverse=True)

print(f'nnnPlayer {hss[0][0]+1} has the strongest hand! [{round(hss[0][1]/10000,6)}]nPlayer {hss[hnumber-1][0] + 1} has the weakest hand :( [{round(hss[hnumber-1][1]/10000,6)}]') if show_strength else print(f'nPlayer {hss[0][0] + 1} has the strongest hand!nPlayer {hss[hnumber-1][0]+1} has the weakest hand :(')

if show_strength:



    print('nnnnnHand Occurence:n')

    for x in range(10):

        print(ho_names[x],hand_occurence[x])



    print('nnnnnFull Player Ranking:n')

    for x in range(len(hss)):

        print(f'{x+1}.',f'Player {hss[x][0]+1}',f'[{round(hss[x][1]/10000,6)}]')

First, some style-issues. Python has an official style-guide, PEP8. It recommends not putting multiple commands on the same line. In addition trailing ; are superfluous.

Now, let's look at the needed structure. You need a Card that contains all information about that card and a Hand which can evaluate a list of cards with respect to the poker rules. You don't actually need a Deck if you just have a list of all cards in the deck and then do random.sample(cards, n_players*5) to get the hands for all players, which you can then distribute to the players.

So, let's have a look at Card first, since you already do have this class. Your valname method is very inefficient. First, it could be that it is called multiple times (this does not seem to be the case). But you also have a chain of ifs, however only ever one of them can be true, so use elif instead. Otherwise all conditions will need to be checked, instead of only all conditions until the first true one.

But even easier here is to use a simple tuple:

class Card:

    value_names = ("Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten",

                   "Jack", "Queen", "King", "Ace")

    def __init__(self, value, suit):

        self.value = value

        self.suit = suit



    def __str__(self):

        return f"{self.value_names[self.value - 1]} of {self.suit}"



    def __repr__(self):

        return f"{self.suit} {self.value}"



    def __lt__(self, other):

        return self.value < other.value



    def __eq__(self, other):

        return self.value == other.value

The __str__ method is a magic method that will be called when you do print(card) and __repr__ will be called when typing card in an interactive session. The __lt__ and __eq__ allow cards to be compared by their value, which is used for example by sorted when we have an iterable of cards.

If you want the fancy unicode names for the suits, just use that when constructing the cards:

from itertools import product



deck = [Card(value, suit) for value, suit in product(range(2, 15), "♥♠♣♦")]

Now let's get to the meat of the problem, evaluating poker hands, which should be the responsibility of the Hands class:

from collections import Counter

from itertools import tee, chain





def difference(iterable):

    a, b = tee(iterable)

    try:

        item = next(b)

    except StopIteration:

        return iter([])

    return chain([item], map(lambda x: x[1] - x[0], zip(a, b)))





class Hand:

    def __init__(self, cards):

        self.cards = sorted(cards)

        self.values = [card.value for card in self.cards]

        self.values_counter = Counter(card.value for card in self.cards)

        self.suits = [card.suit for card in self.cards]

        self.low_card, self.high_card = self.values[0], self.values[-1]



    def __repr__(self):

        return ", ".join(repr(card) for card in self.cards)



    def flush(self):

        return len(set(self.suits)) == 1



    def straight(self):

        diffs = sorted(list(difference(self.values))[1:])

        return diffs in ([1, 1, 1, 1], [-12, 1, 1, 1])



    def fullhouse(self):

        candidate = self.values_counter.most_common(2)

        return candidate[0][1] == 3 and candidate[1][1] == 2



    def evaluate(self):

        # flush/straight flush/royal flush

        if self.flush():

            if self.straight():

                # royal flush

                if self.high_card == 14 and self.low_card == 10:

                    return "Royal Flush", 10000

                # straight flush

                return "Straight Flush", 8999 + self.low_card

            # flush

            return "Flush", 6000 + sum(10**k * x

                                       for k, x in zip([1, -1, -2, -3], self.values))

        # straight

        elif self.straight():

            if self.high_card == 14 and self.low_card == 2:

                return "Straight", 5000

            return "Straight", 4999 + self.low_card

        # fullhouse

        elif self.fullhouse():

            triple, pair = self.values_counter.most_common(2)

            return "Full House", 7000 + 10 * triple[0] + pair[0]

        # two pair

        candidate1, candidate2, *rest = self.values_counter.most_common()

        rest = sorted(r[0] for r in rest)

        if candidate1[1] == candidate2[1] == 2:

            c0, c1 = sorted([candidate1[0], candidate2[0]])

            return "Two Pairs", 3000 + 10* c0 + c1 + sum(10**k * x

                                                         for k, x in zip([-1, -2], rest))

        # quad

        candidate, *rest = self.values_counter.most_common()

        rest = sorted(r[0] for r in rest)

        if candidate[1] == 4:

            return "Quad", 8000 + 10 * candidate[0] + rest[0]

        # triple

        elif candidate[1] == 3:

            return "Triple", 4000 + 10*candidate[0] + rest[0] + .1*rest[1]

        # pair

        elif candidate[1] == 2:

            return "Pair", 2000 + 10*candidate[0] + rest[0] + .1*rest[1] + .01*rest[2]

        # highcard

        return "High Card", self.high_card

The difference function is taken from the more_itertools package.
A collections.Counter object is exactly what it says. If you pass it an iterable it will count how often each object appears and it has some nice methods like most_common which returns tuples of element, count, sorted decreasingly by count.

Now that we have that the main loop becomes quite a bit easier:

from itertools import zip_longest, islice, product

from random import sample



def grouper(iterable, n, fillvalue=None):

    "Collect data into fixed-length chunks or blocks"

    # grouper('ABCDEFG', 3, 'x') --> ABC DEF Gxx"

    args = [iter(iterable)] * n

    return zip_longest(*args, fillvalue=fillvalue)



if __name__ == "__main__":

    deck = [Card(value, suit) for value, suit in product(range(2, 15), "♥♠♣♦")]

    rounds = int(input("How many rounds? "))

    players = int(input("How many players (max 10)? "))

    show_strength = input("Show result each round? ").lower()[0] == "y"

    assert players <= 10

    hand_occurrence = Counter()



    for _ in range(rounds):

        hands = [Hand(cards) for cards in grouper(sample(deck, players * 5), 5)]

        evaluated_hands = [hand.evaluate() for hand in hands]

        hand_occurrence += Counter(hand[0] for hand in evaluated_hands)

        if show_strength:

            strongest = max(evaluated_hands, key=lambda hand: hand[1])

            print("Strongest hand:", 

    print("Statistics:", strongest) hand_occurrence.most_common())

The grouper function which I used to split the hands into groups of 5 cards each is from the itertools recipes.

I did not bother to use nicer user input functions here, but there are plenty examples on this site on how to do it more foolproof (and keep on asking if the supplied input is somehow wrong).

This code takes about 3.14 s ± 82 ms for 10,000 rounds and about 34.4 s ± 483 ms for 100,000 rounds on my machine, without printing the results from each round.