Python poker library

pokerlib

A lightweight Python poker library that focuses on simplifying a poker game implementation when its io is supplied. It includes modules that help with hand parsing and poker game continuation.

One application of this library was made by the PokerMessenger app, which supplies library with io in the form of messenger group threads. The app's repo is at https://github.com/kuco23/pokermessenger.

To install, run

pip install pokerlib


Usage

Library consists of a module for parsing cards, which can be used seperately, and modules that aid in running a poker game.

HandParser

This module helps with parsing hands. A hand usually consists of 2 dealt cards plus 5 on the board, and HandParser is optimized to work with up to 7 cards (otherwise flushes and straights require some small additional work). A card is defined as a pair of two enums. All of the enums used are of IntEnum type, so you can also freely interchange them for integers. Below is an example of how to construct two different hands and then compare them.

hand1 = HandParser([
])

hand2 = HandParser([
(Rank.TWO, Suit.CLUB)
])

board = [
(Rank.TWO, Suit.HEART)
]

# add new cards to each hand
hand1 += board # add the board to hand1
hand2 += board # add the board to hand2

print(hand1.handenum) # Hand.STRAIGHTFLUSH
print(hand2.handenum) # Hand.STRAIGHTFLUSH
print(hand1 > hand2) # True


note: In the previous version, each hand had to be parsed manually, now calling any of the methods requiring the hand to be parsed, triggers parsing. Note that the only way to add new cards to a hand is through the __iadd__ method. If this method is called with hand already parsed, it logs that a new parsing is required.

It is also possible to fetch hand's kickers.

hand = HandParser([
(Rank.TWO, Suit.DIAMOND),
(Rank.ACE, Suit.CLUB),
(Rank.THREE, Suit.DIAMOND),
(Rank.TEN, Suit.HEART),
(Rank.SIX, Suit.HEART),
(Rank.KING, Suit.CLUB)
])

print(list(hand.kickercards))
# [
#   (<Rank.ACE: 12>, <Suit.CLUB: 1>),
#   (<Rank.KING: 11>, <Suit.CLUB: 1>),
#   (<Rank.TEN: 8>, <Suit.HEART: 3>)
# ]


Note that the attribute kickers saves the indices of hand.cards that form kickercards.

Using HandParser, we can estimate the probability of a given hand winning the game with given known cards on the table (as implemented in another python cli-app here). We do this by repeatedly random-sampling hands, then averaging the wins. Mathematically, this process converges to the probability by the law of large numbers.

from random import sample
from itertools import product
from pokerlib import HandParser
from pokerlib.enums import Rank, Suit

def getWinningProbabilities(players_cards, board=[], n=1000):
cards = list(product(Rank, Suit))
for card in board: cards.remove(card)
for player_cards in players_cards:
for card in player_cards:
cards.remove(card)

wins = [0] * len(players_cards)
for i in range(n):
board_ = sample(cards, 5-len(board))
hands = [
HandParser(player_cards + board + board_)
for player_cards in players_cards
]
winner = max(hands)
for i, hand in enumerate(hands):
if hand == winner: wins[i] += 1

return [win / n for win in wins]

w1, w2 = getWinningProbabilities([
[(Rank.ACE, Suit.HEART), (Rank.KING, Suit.HEART)],
])


Poker Game

A poker table can be established by providing its configuration. A poker table object responds to given input with appropriate output, which can be customized by overriding the two functions producing it.

from pokerlib import Player, PlayerGroup, Table

# just print the output
class MyTable(Table):
def publicOut(self, out_id, **kwargs):
print(out_id, kwargs)
def privateOut(self, player_id, out_id, **kwargs):
print(out_id, kwargs)

table = MyTable(
table_id = 0
seats = 2
players = PlayerGroup([])
small_blind = 5
big_blind = 10
)


Players could be passed inside MyTable constructor, but as they usually join the table after its definition, we will do that below.

player1 = Player(
table_id = table.id,
_id = 1,
name = 'alice',
)
player2 = Player(
table_id = table.id,
_id = 2,
name = 'bob',
)
table += [player1, player2]


Communication with the table object is established through specified enums, which can be modified by overriding table's publicIn method. Using enums, we can implement a poker game as shown below.

from pokerlib.enums import RoundPublicInId, TablePublicInId

table.publicIn(player1.id, TablePublicInId.STARTROUND)
table.publicIn(player1.id, RoundPublicInId.CALL)
table.publicIn(player2.id, RoundPublicInId.CHECK)
table.publicIn(player1.id, RoundPublicInId.CHECK)
table.publicIn(player2.id, RoundPublicInId.RAISE, raise_by=50)
table.publicIn(player1.id, RoundPublicInId.CALL)
table.publicIn(player1.id, RoundPublicInId.CHECK)
table.publicIn(player2.id, RoundPublicInId.CHECK)
table.publicIn(player1.id, RoundPublicInId.ALLIN)
table.publicIn(player2.id, RoundPublicInId.CALL)


Wrong inputs are mostly ignored, though they can produce a response, when that seems useful. As noted before, when providing input, the table object responds with output ids (e.g. PLAYERACTIONREQUIRED) along with additional data that depends on the output id. For all possible outputs, check RoundPublicInId and TablePublicInId enums.

A new round has to be initiated by one of the players every time the previous one ends (or at the beginning). A simple command line game, where you respond by enum names, can be implemented as below (for working version check tests/round_test.py).

# define a table with fixed players as before
table = ...
while table:
while table and not table.round:
table.publicIn(
table.players[0].id,
TablePublicInId.STARTROUND
)

player = table.round.current_player
inp = input(f"require input from {player.id}: ")

if inp in RoundPublicInId.__members__:
action, raise_by = RoundPublicInId.__members__[inp], 0
elif inp.startswith(RoundPublicInId.RAISE.name):
raise_by = int(inp.split()[1])
action, raise_by = RoundPublicInId.RAISE, raise_by
else:
continue

table.publicIn(player.id, action, raise_by=raise_by)


Tests

Basic tests for this library are included. You can test handparser by running

python tests/handparser.py


and the poker game by calling

python tests/round_test.py <player_number>


which will run a poker game simulation with raw data getting printed to stdout.

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