Pyminion is a library for executing and analyzing games of Dominion. At its core, pyminion implements the rules and logic of Dominion and provides an API to interact with the game engine. In addition, it enables interactive games through the command line and simulation of games between bots.
Pyminion requires at least Python 3.8 and can easily be installed through pypi
python3 -m pip install pyminion
To play an interactive game through the command line against a bot, initialize a human and a bot and assign them as players. Alternatively, games can be created between multiple humans or multiple bots.
from pyminion.expansions.base import base_set
from pyminion.game import Game
from pyminion.bots.examples import BigMoney
from pyminion.players import Human
# Initialize human and bot
human = Human()
bot = BigMoney()
# Setup the game
game = Game(players=[human, bot], expansions=[base_set])
# Play game
game.play()Defining new bots is relatively straightforward. Inherit from the Bot class and implement play and buy strategies in the action_priority and buy_priority methods respectively.
For example, here is a simple big money + smithy bot:
from pyminion.bots.bot import Bot
from pyminion.game import Game
from pyminion.expansions.base import silver, gold, province, smithy
class BigMoneySmithy(Bot):
def __init__(
self,
player_id: str = "big_money_smithy",
):
super().__init__(player_id=player_id)
def action_priority(self, game: Game):
yield smithy
def buy_priority(self, game: Game):
money = self.state.money
if money >= 8:
yield province
if money >= 6:
yield gold
if money == 4:
yield smithy
if money >= 3:
yield silverTo see other bot implementations with more advanced decision trees, see /bots
Simulating multiple games is good metric for determining bot performance. To create a simulation, pass a pyminion game instance into the Simulator class and set the number of iterations to be run.
from pyminion.bots.examples import BigMoney, BigMoneySmithy
from pyminion.expansions.base import base_set, smithy
from pyminion.game import Game
from pyminion.simulator import Simulator
bm = BigMoney()
bm_smithy = BigMoneySmithy()
game = Game(players=[bm, bm_smithy], expansions=[base_set], kingdom_cards=[smithy])
sim = Simulator(game, iterations=1000)
sim.run()with the following terminal output:
~$ python simulation.py
Simulation of 1000 games
big_money wins: 16.8% (168)
big_money_smithy wins: 57.5% (575)
Ties: 25.7% (257)Please see /examples to see demo scripts.
Please open an issue for support.
Install this library, test it out, and report any bugs. A welcome contribution would be to create new bots, especially an implementation that uses machine learning to determine optimal play.
If you would like to contribute, please create a branch, add commits, and open a pull request.