Tic Tac Toe in Python

tictactoe.py

'''
Tic Tac Toe

A very (very) basic game in Python
'''

def tictactoe():

    #create an empty raster
    def makeRaster(row, col):

        #make 3 rows (lists) with 3 columns (values)
        r = []
        for i in range(row):

            r.append([])

            for j in range(col):

                r[i].append('-')

        return r


    #print the raster as a playfield
    def printRaster(r, x, y, player):

        for i in range(len(r)):

            #if the x & y pos is not set with X or O, make move (player)
            if r[x][y] == '-':

                r[x][y] = player

            print r[i]


    #players
    #checkes for player X or O and switches them each round
    def players(player):

        if player == '0':

            return 'X'

        else:

            return '0'


    #begin the game
    raster = makeRaster(5,5)
    player = '0'

    #loop to get X and Y from players
    while True:

        print 'Player ' + player + ':'

        x = int(raw_input('X: '))
        y = int(raw_input('Y: '))

        #print raster with 1. empty raster, 2. new x and y pos, 3. player 0 or X
        printRaster(raster, x, y, player)

        #next player
        player = players(player)

tictactoe()