TicTacToe

# Tic Tac Toe, text based (no gui)
# Demo of 2D arrays

# define some constants
EMPTY = "."
X = "X"
O = "O"

board = []

def clearBoard():
    global board
    board = []
    for row in range(3):
        board.append([])
        for col in range(3):
            board[row].append(EMPTY)
    # Could also be done like this:
    #board = [ [EMPTY, EMPTY, EMPTY],
    #          [EMPTY, EMPTY, EMPTY],
    #          [EMPTY, EMPTY, EMPTY] ]

def showBoard():
    print # empty line before
    for row in range(3):
        for col in range(3):
            print board[row][col],
        print # end of row
    print # empty line after

def checkRows(who):
    for row in range(3):
        if board[row][0]==who and board[row][1]==who and board[row][2]==who:
            return True
    return False

def checkCols(who):
    for col in range(3):
        if board[0][col]==who and board[1][col]==who and board[2][col]==who:
            return True
    return False

def checkDiagonals(who):
    d1 = board[0][0]==who and board[1][1]==who and board[2][2]==who
    d2 = board[2][0]==who and board[1][1]==who and board[0][2]==who
    return d1 or d2

def checkWin(who):
    return checkRows(who) or checkCols(who) or checkDiagonals(who)

def play():
    turn = X     # X always plays first
    clearBoard()
    while True:
        if checkWin(X):
            print "X wins!"
            return
        if checkWin(O):
            print "O wins!"
            return
        row = int(raw_input(turn + ", what row? "))
        col = int(raw_input(turn + ", what col? "))
        if board[row][col] != EMPTY:
            print "You Cheated!"
            print turn, "loses!"
            return
        board[row][col] = turn
        showBoard()
        if turn==X:
            turn = O
        else:
            turn = X

play() # start the game