player1 = 'X'
player2 = 'O'
#The grid variable defines the spaces that will be printed to make up
#the board. 
grid = [['\t  ', '1', ' ', ' ', ' ', '2', ' ', ' ', ' ', '3', ' ', ' '],
        ['\t1 ', '_', '_', '_', '|', '_', '_', '_', '|', '_', '_', '_'], 
        ['\t2 ', '_', '_', '_', '|', '_', '_', '_', '|', '_', '_', '_'],
        ['\t3 ', ' ', ' ', ' ', '|', ' ', ' ', ' ', '|', ' ', ' ', ' ']]
 
def print_grid():
    '''takes the grid variable and prints it as a tic tac toe board.'''
    print(''.join(grid[0]), '\n', ''.join(grid[1]), '\n', ''.join(grid[2]), '\n', ''.join(grid[3]))
 
def play_tic():
    '''This function runs the game play.'''
    player_turn(player1, 'Player one')
    player_turn(player2, 'Player two')
    play_tic()
 
def player_turn(player, player_name):
    #Allows player to choose a position, places marker in position, checks for winner.
    print(f"\t{player_name}, it's your turn.")
    choice(player)
    print_grid()
    check_winner(player)
 
def choice(player):
    '''Takes the value returned by the input_request function and places
    an 'X' or an 'O' in the space chosen by the player.'''
    x = input_request('horizontal row')
    y = input_request('vertical column')
 
    if y == 2:
        y = 6
    elif y == 3:
        y = 10
 
    if grid[x][y] == 'X' or grid[x][y] == 'O':
        print("\tThat space is taken. Please choose another.")
        choice(player)
    else:
        grid[x][y] = player
 
def input_request(axis):
    '''Asks player where they would like to position marker, 
    and checks to make sure that the input corresponds to position.'''
    user_input = input(f"\tWhich {axis} do you choose - 1, 2, or 3?")
    while user_input not in ['1', '2', '3']:
        print("\tSorry, but that answer is unacceptable.")
        user_input = input("\tPlease choose a digit - 1, 2, or 3.")
    return int(user_input)
 
def check_winner(player):
    '''Checks to see if the last move resulted in a winning configuration. 
    ###I feel that there must be a way to make this shorter###'''
    draw_list = [grid[1][1], grid[1][6], grid[1][10], grid[2][1], grid[2][6], grid[2][10], grid[3][1], grid[3][6], grid[3][10]]
 
    if ((grid[1][1] == player and grid[1][6] == player and grid[1][10] == player)
        or (grid[2][1] == player and grid[2][6] == player and grid[2][10] == player)
        or (grid[3][1] == player and grid[3][6] == player and grid[3][10] == player)
        or (grid[1][1] == player and grid[2][1] == player and grid[3][1] == player)
        or (grid[1][6] == player and grid[2][6] == player and grid[3][6] == player)
        or (grid[1][10] == player and grid[2][10] == player and grid[3][10] == player)
        or (grid[1][1] == player and grid[2][6] == player and grid[3][10] == player)
        or (grid[1][10] == player and grid[2][6] == player and grid[3][1] == player)
        ):
        print(f"Congratulations, {player}, you are the winner!!!")
        play_again()
    elif '_' and ' ' not in draw_list:
        print("The game is a draw.")
        play_again()
    else:
        pass
 
def play_again():
    answer = input("Do you want to play again? Please answer Y or N.")
    #I not clear on what global does here. I'm not sure why I thought this would help my code, but it does.
    # If I remove it, then the grid variable
    #does not reset to the value shown below, but instead remains the same as at the end of the last game play#
    #this works, but it seems unsatisfactory. It seems there must be a better way.  
    global grid
    if answer.upper() == 'N':
        print("Thank you for playing. Have a nice day!")
        exit()
    elif answer.upper() == 'Y': 
        #I don't like repeating the grid variable assignment here, but I couldn't think of another way
        #to reset the board to begin a second game. Well, I tried, but couldn't think of anything that worked. 
        grid = [['\t  ', '1', ' ', ' ', ' ', '2', ' ', ' ', ' ', '3', ' ', ' '],
                ['\t1 ', '_', '_', '_', '|', '_', '_', '_', '|', '_', '_', '_'], 
                ['\t2 ', '_', '_', '_', '|', '_', '_', '_', '|', '_', '_', '_'],
                ['\t3 ', ' ', ' ', ' ', '|', ' ', ' ', ' ', '|', ' ', ' ', ' ']]
        print_grid()
        play_tic()
    else:
        print("That is not an acceptable answer.")
        play_again()
 
print("\n\tLet's play tic tac toe.")
print("\tPlayer one will be 'X'.")
print_grid()
play_tic()