Rock Paper Scissor

A collection of 2-player rock paper scissor games.

This includes:

  • A Standard Rock Paper Scissor class.

  • An Asymmetric Rock Paper Scissor class.

class imperfecto.games.rock_paper_scissor.ROCK_PAPER_SCISSOR_ACTIONS(value)[source]

Bases: imperfecto.misc.utils.lessVerboseEnum, enum.IntEnum

Available actions for the rock-paper-scissors game.

ROCK = 0
PAPER = 1
SCISSOR = 2
class imperfecto.games.rock_paper_scissor.RockPaperScissorGame(players)[source]

Bases: imperfecto.games.game.NormalFormGame

A (standard) 2-player rock-paper-scissor (extensive-form) game.

Payoff:

Rock beats scissors, scissors beats paper, and paper beats rock. Winner gets +1 payoff, loser gets -1 payoff.

Nash Equilibrium:

The nash strategy (unexploitable) is (1/3, 1/3, 1/3) (payoff = 0 for all)

actions

alias of imperfecto.games.rock_paper_scissor.ROCK_PAPER_SCISSOR_ACTIONS

n_players: int = 2
get_payoffs(history)[source]

Return the payoff for each player at the current node.

Note

history must be a terminal node.

Parameters

history (Sequence[ROCK_PAPER_SCISSOR_ACTIONS]) – The history of the game.

Return type

Sequence[float]

Returns

The payoffs of the players at the end of the game.

class imperfecto.games.rock_paper_scissor.AsymmetricRockPaperScissorGame(players)[source]

Bases: imperfecto.games.rock_paper_scissor.RockPaperScissorGame

An asymmetric 2-player rock-paper-scissors (extensive-form) game.

Payoff:

Rock beats scissors, scissors beats paper, and paper beats rock. But winner gets +2 payoff, loser gets -2 payoff when someone plays scissor. Otherwise, winner gets +1 payoff, loser gets -1 payoff.

Nash Equilibrium:

The Nash strategy (unexploitable) is (0.4, 0.4, 0.2) (payoff = 0 for all)

get_payoffs(history)[source]

Override the get_payoffs function of standard rock-paper-scissors.

The winner gets +2 payoff, loser gets -2 payoff when someone plays scissor. Otherwise, winner gets +1 payoff, loser gets -1 payoff.

Parameters

history (Sequence[ROCK_PAPER_SCISSOR_ACTIONS]) – The history of the game.

Return type

Sequence[float]

Returns

The payoffs of the players.