tic tac toe.py

tic tac toe.py

import random

def drawBoard(board):
	print(' | |')
	print(' ' + board[7] + ' | ' + board[8] + ' | ' + board[9])
	print(' | |')
	print('-----------')
	print(' | |')

	print(' ' + board[4] + ' | ' + board[5] + ' | ' + board[6])
	print(' | |')
	print('-----------')
	print(' | |')
	print(' ' + board[1] + ' | ' + board[2] + ' | ' + board[3])
	print(' | |')

def inputPlayerLetter():
	letter = ''
	while not (letter == 'X' or letter == 'O'):
		letter = raw_input('Do you want to be X or O').upper()
		#print "Do you want to be X or O?"
		#letter = input().upper()

		if letter == 'X':
			return ['X','O']
		else:
			return ['O','X']

def whoGoesFirst():
	if random.randint(0,1) == 0:
		return 'computer'
	else:
		return 'player'

def playAgain():
	print "Do you want to play again? (yes or no)"
	return input().lower().startswith('y')

def makeMove(board, letter, move):
	board[move] = letter

"""  Commented out portion is what I'm trying to achieve
def isWinner(bo, le):
    # Given a board and a player's letter, this function returns True if that player has won.
    # We use bo instead of board and le instead of letter so we don't have to type as much.
    return ((bo[7] == le and bo[8] == le and bo[9] == le) or # across the top
    (bo[4] == le and bo[5] == le and bo[6] == le) or # across the middle
    (bo[1] == le and bo[2] == le and bo[3] == le) or # across the bottom
    (bo[7] == le and bo[4] == le and bo[1] == le) or # down the left side
    (bo[8] == le and bo[5] == le and bo[2] == le) or # down the middle
    (bo[9] == le and bo[6] == le and bo[3] == le) or # down the right side
    (bo[7] == le and bo[5] == le and bo[3] == le) or # diagonal
    (bo[9] == le and bo[5] == le and bo[1] == le)) # diagonal"""

def isWinner(bo, le):
	return ((bo[7] == le and bo[8] == le and bo[9] == le)) or(bo[4] == le and bo[5] == le and bo[6] == le) or (bo[1] == le and bo[2] == le and bo[3] == l(bo[7] == le and bo[4] == le and bo[1] == le) or(bo[8] == le and bo[5] == le and bo[2] == le) or 	(bo[9] == le and bo[6] == le and bo[3] == le) or(bo[7] == le and bo[5] == le and bo[3] == le) or (bo[9] == le and bo[5] == le and bo[1] == le)) 

def getBoardCopy(board):
	dupeBoard = []

	for i in board:
		dupeBoard.append(i)

		return dupeBoard

def isSpaceFree(board, move):

	return board[move] == ''

def getPlayerMove(board):
	move = ''
	while move not in '1 2 3 4 5 6 7 8 9'.split() or not isSpaceFree(board, int(move)):
		#print "What is your next move? (1-9)"
		#move = input()
		move = raw_input('What is your next move? (1-9)')
		return int(move)

def chooseRandomMoveFromList(board, movesList):
	possibleMoves = []
	for i in movesList:
		if isSpaceFree(board, i):
			possibleMoves.append(i)

	if len(possibleMoves) != 0:
		return random.choice(possibleMoves)
	else:
		return None

def getComputerMove(board,computerLetter):
	if computerLetter == 'X':
		playerLetter = '0'
	else:
		playerLetter = 'X'

	for i in range(1,10):
		copy = getBoardCopy(board)
		if isSpaceFree(copy, i):
			makeMove(copy, computerLetter, i)
			if isWinner(copy, computerLetter):
				return i

	move = chooseRandomMoveFromList(board, [1, 3, 7, 9])
	if move != None:
		return move

	if isSpaceFree(board, 5):
		return 5

	return chooseRandomMoveFromList(board, [2, 4, 6, 8])

def isBoardFull(board):
	for i in range(1, 10):
		if isSpaceFree(board, i):
			return False
	return True

print "Welcome to Tic Tac Toe!"

while True:
	theBoard= [''] * 10
	playerLetter, computerLetter = inputPlayerLetter()
	turn = whoGoesFirst()
	print "The %s will go first" % turn
	gameIsPlaying = True

	while gameIsPlaying:
		if turn == 'player':
			drawBoard(theBoard)
			move = getPlayerMove(theBoard)
			makeMove(theBoard, playerLetter, move)

			if isWinner(theBoard, playerLetter):
				drawBoard(theBoard)
				print "Hooray!  you have won"
				gameIsPlaying = False
			else:
				if isBoardFull(theBoard):
					drawBoard(theBoard)
					print "The game is a tie"
				else:
					turn = 'computer'
		else:
			move = getComputerMove(theBoard, computerLetter)
			makeMove(theBoard, computerLetter, move)

			if isWinner(theBoard, computerLetter):
				drawBoard(theBoard)
				print "The computer has beaten you, you lose"
				gameIsPlaying = False
			else:
				if isBoardFull(theBoard):
					drawBoard(theBoard)
					print "The game is a tie!"
					break
				else:
					turn = 'player'
		if not playAgain():
			break