tictactoe.py

BLANK = "_"
X = "X"
O = "O"


def print_board(board):
    for line in board:
        print(" ".join(board))

def is_game_over(board):
    diagonals = [(board[0][0], board[1][1], board[3][3]),
                 (board[0][2], board[1][1], board[2][0])]
    rows = [[board[y][x] for x in range(3)] for y in range(3)]
    columns = [[board[y][x] for y in range(3)] for x in range(3)]
    lines = [line for type_ in [diagonals, rows, columns] for line in type_]
    for line in lines:
        if line[0] == line[1] == line[2] and line[0] != BLANK:
            return True
    return False

def game():
    board = [[BLANK, BLANK, BLANK],
             [BLANK, BLANK, BLANK],
             [BLANK, BLANK, BLANK]]
    while not is_game_over(board):
        # play the game