RPS AI -- Python

gistfile1.py

import random

#Setting initial variables
winCount = 0
throwCount = 0
lossCount = 0
drawCount = 0

#The player's previous selection determines the current state for the next game. The initial state is used as the current state for the first game where there is no "last move."
initialState = ["rock", "paper", "scissors"]
rockState = ["rock", "paper", "scissors"]
paperState = ["rock", "paper", "scissors"]
scissorState = ["rock", "paper", "scissors"]

#Setting the current state to initial state for the first game.
currentState = initialState

#Declaring main function. Computer throws first, then player. Throws are compared and results for current game are determined. Final results are used to record player's choice in current state and switch to new state for next round.
def main():
    print("Let's play Rock, Paper, Scissors!")
    compThrow = getCompGuess()
    playerThrow = getPlayerThrow()
    outcome = getOutcome(compThrow, playerThrow)
    results = getResults(outcome, compThrow, playerThrow, winCount, lossCount, drawCount)
    print("W/L/D")
    print(results)
    getNewState(playerThrow, rockState, paperState, scissorState, currentState)
    restart()

#The computer uses the current state to predict player's next move based on his/her choices in the past.
def getCompGuess():
    compGuess = random.choice(currentState)
    #Based on computer's prediction, the appropriate counter-move is chosen.
    if compGuess == "rock":
        compThrow = "paper"
    elif compGuess == "paper":
        compThrow = "scissors"
    elif compGuess == "scissors":
        compThrow = "rock"
    return compThrow

#Asks player to input his/her selection.
def getPlayerThrow():
    playerThrow = input('Choose your weapon: rock, paper or scissors')
    return playerThrow

#Compares the computer's choice against the player's to determine a winner.
def getOutcome(compThrow, playerThrow):
    if compThrow == "rock" and playerThrow == "paper":
        print("You win!")
        return "You win!"
    elif compThrow == "paper" and playerThrow == "scissors":
        print("You win!")
        return "You win!"
    elif compThrow == "scissors" and playerThrow == "rock":
        print("You win!")
        return "You win!"
    elif compThrow == "scissors" and playerThrow == "paper":
        print("You lose!")
        return "You lose!"
    elif compThrow == "paper" and playerThrow == "rock":
        print("You lose!")
        return "You lose!"
    elif compThrow == "rock" and playerThrow == "scissors":
        print("You lose!")
        return "You lose!"
    elif compThrow == playerThrow:
        print("Draw!")
        return "Draw!"

def getResults(outcome, compThrow, playerThrow, winCount, lossCount, drawCount):
    if outcome == "You win!":
        winCount += 1
    elif outcome == "You lose!":
        lossCount += 1
    elif outcome == "Draw!":
        drawCount += 1
    return "%s/%s/%s" % (winCount, lossCount, drawCount)

def getNewState(playerThrow, rockState, paperState, scissorState, currentState):
    if playerThrow == "rock":
        currentState.extend("rock")
        return currentState
        return currentState
    elif playerThrow == "scissors":
        currentState.extend("scissors")
        currentState = scissorState
        return currentState
    elif playerThrow == "paper":
        currentState.extend("paper")
        currentState = scissorState
        return currentState

def restart():
    answer = input("Would you like to play again? y/n")
    if answer == "y":
        main()
    elif answer == "n":
        print("Goodbye!")
    else:
        print("Sorry! I didn't understand your answer. Enter y for yes or n for no.")
        restart()

main()