Tick-Tack-Toe Verifier

tick_tack_toe_verifier.py

def tick_tack_toe_verifier(game_result):
    '''
    Input  : A nXn grid ('game_result')
    Output : Checks the status of game in 'game_result'. If there is a winner
    it return 'X' or 'O', else in case of a draw, it returns 'D'.
    '''
    for r in range(len(game_result)):
        x, o = 0, 0
        for c in range(len(game_result)):
            if game_result[r][c] == 'X':
                x += 1
            if game_result[r][c] == 'O':
                o += 1
        if x == len(game_result):
            return 'X'
        elif o == len(game_result):
            return 'O'

    for c in range(len(game_result)):
        x, o = 0, 0
        for r in range(len(game_result)):
            if game_result[r][c] == 'X':
                x += 1
            if game_result[r][c] == 'O':
                o += 1
        if x == len(game_result):
            return 'X'
        elif o == len(game_result):
            return 'O'

    x, o = 0, 0
    for r in range(len(game_result)):
        for c in range(len(game_result)):
            if r == c:
                if game_result[r][c] == 'X':
                    x += 1
                if game_result[r][c] == 'O':
                    o += 1
                break
    if x == len(game_result):
        return 'X'
    elif o == len(game_result):
        return 'O'

    x, o = 0, 0
    for r in range(len(game_result)):
        for c in range(len(game_result)-1,-1,-1):
            if r+c == len(game_result)-1:
                if game_result[r][c] == 'X':
                    x += 1
                if game_result[r][c] == 'O':
                    o += 1
                break
    if x == len(game_result):
        return 'X'
    elif o == len(game_result):
        return 'O'
    return 'D'