tic tac toe

tictac.py

grid= [['','',''],
       ['','',''],
       ['','','']]

def x(y,x):
    '''Player X's turn
'''
    if not grid[y][x]:
        grid[y][x]='x'
        if check_status(grid)!=None:
            print "The winner is ", check_status(grid)
        return grid
    else:
        return grid

def o(y,x):
    '''Player O's turn
'''
    if not grid[y][x]:
        grid[y][x]='o'
        if check_status(grid)!=None:
            print "The winner is ", check_status(grid)
        return grid
    else:
        return grid

def check_status(grid):

    #if all the items on a column are same:
    for x in range(3):
        l=None
        win=True
        for y in range(3):
            if not l: l=grid[y][x] #l has topmost item
            elif l!=grid[y][x]: win=False
            
        if win!=False and l!='':
            winner=l
            return winner
        

    #check rows
    for y in range(3):
        
        s=None
        win=True
        for x in range(3):
            if not s: s=grid[y][x] #s now has leftmost item
            elif s!=grid[y][x]: win=False

        if win!=False and s!='':
            winner=s
            return winner

    #check diagonals
    ####top left to bottom right
    y=0
    x=0
    if grid[y][x]==grid[y+1][x+1]==grid[y+2][x+2] and grid[y][x]!='':
        return grid[y][

    ####Top right to bottom left
    y=2
    x=2
    if grid[y][x]==grid[y-1][x-1]==grid[y-2][x-2] and grid[y][x]!='':
        return grid[y][x]