tictactoe.py

validInputs = ['0','1','2'];
spaceStates = {
			"blank": '___',
			"X": '_X_',
			"O": '_O_'}

#Checks for a win based on what player you are and where you just made a move
def checkForWin(board,xPos,yPos,currentPlayer):
	intendedState = spaceStates[currentPlayer]
	return (
		#Win State 1: Fills a row
		((board[0][yPos] == intendedState and board[1][yPos] == intendedState and board[2][yPos] == intendedState)
		#Win State 2: Fills a column
		or (board[xPos][0] == intendedState and board[xPos][1] == intendedState and board[xPos][2] == intendedState)
		#Win State 3: Fills a diagonal
		or (board[0][0] == intendedState and board[1][1] == intendedState and board[2][2] == intendedState)
		#Win State 4: Fills the other diagonal
		or (board[2][0] == intendedState and board[1][1] == intendedState and board[0][2] == intendedState))
		)

class Game:
	def __init__(self):
		self.board = [['___']*3, ['___']*3, ['___']*3];
		self.gameFinished = False
		self.winner = ""
		self.currentPlayer = 'X'
		self.movesCompleted = 0


	#Function to change the player for the turn
	def togglePlayer(self):
		if (self.currentPlayer == 'X'):
			self.currentPlayer = 'O'
		elif (self.currentPlayer == 'O'):
			self.currentPlayer = 'X'

	#Function to respond to a move based on input
	def respondToMove(self,xPos,yPos):
		#Case 0: Inputs are out of bounds for the matrix
		if (xPos not in validInputs or yPos not in validInputs):
			print("Sorry, choose again")
			xPos_new = input('Choose an x coord:\n')
			yPos_new = input('Choose an y coord:\n')
			self.respondToMove(xPos_new, yPos_new)

		#Case 1: new position is taken
		elif (self.board[int(xPos)][int(yPos)] != spaceStates["blank"]):
			print('Sorry, choose again.')
			xPos_new = input('Choose an x coord:\n')
			yPos_new = input('Choose an y coord:\n')
			self.respondToMove(xPos_new, yPos_new)
		
		#Case 2: new position is valid
		else:
			xPos = int(xPos)
			yPos = int(yPos)

			if (self.currentPlayer == 'X'):
				self.board[xPos][yPos] = spaceStates["X"]
			else:	
				self.board[xPos][yPos] = spaceStates["O"]

			self.movesCompleted += 1

			#Case 2a: new position results in a win
			if (checkForWin(self.board,xPos,yPos,self.currentPlayer)):
				self.gameFinished = True

			#Case 2b: new position is valid and doesn't result in a win
			else:
				self.togglePlayer()


	
	def printState(self):
		print('\n\n')
		print('        x   ')
		print('')
		print('       0   1   2')
		print('      ___ ___ ___ ')
		print(f'   0 |{self.board[0][0]}|{self.board[1][0]}|{self.board[2][0]}|')
		print(f'y  1 |{self.board[0][1]}|{self.board[1][1]}|{self.board[2][1]}|')
		print(f'   2 |{self.board[0][2]}|{self.board[1][2]}|{self.board[2][2]}|\n\n')


def main():
	game = Game()
	#Keep increasing the turns until there is a winner or the board is full
	while (game.gameFinished == False and game.movesCompleted < 9):
		game.printState()
		print(f'Turn {game.movesCompleted+1}: Player {game.currentPlayer}\'s move!')
		xPos = input('Choose an x coord:\n')
		yPos = input('Choose an y coord:\n')
		game.respondToMove(xPos,yPos)
	if (game.gameFinished):
		print(f'\n\n________________\n')
		print(f'PLAYER {game.currentPlayer} WON!!!')
		game.printState()
	else:
		print(f'\n\n________________\n')
		print(f'TIE ! NO PLAYERS WON')
		game.printState()

main();