Tic Tac Toe in Python

tic_tac_toe.py

# --------------------- Variable --------------------------

game_board = [" - ", " - ", " - ", " - ", " - ", " - ", " - ", " - ", " - "]

players = [" X ", " O "]

winner = ""

game_still_on = True

exception_log = []

# -------------- End ----------------

# ----------- Functions -------------


def print_board():
    print()
    print(
        game_board[2]
        + " | "
        + game_board[1]
        + " | "
        + game_board[0]
        + "\n"
        + game_board[5]
        + " | "
        + game_board[4]
        + " | "
        + game_board[3]
        + "\n"
        + game_board[8]
        + " | "
        + game_board[7]
        + " | "
        + game_board[6]
    )


def player_input(player):
    input_position = input("Enter a position from 1-9: ")

    try:
        input_position = 8 - (int(input_position) - 1)
        game(player, input_position)

    except Exception:
        print("\n Invalid Input ! Try Again ! \n")
        player_input(player)


def game(player, input_position):
    if game_board[input_position] == " - ":
        game_board[input_position] = player

    else:
        print("\n Position already taken ! Try Again ! \n")
        player_input(player)


def check_columns():

    global winner

    if game_board[0] == game_board[1] == game_board[2] != " - ":
        winner = game_board[0]

    elif game_board[3] == game_board[4] == game_board[5] != " - ":
        winner = game_board[3]

    elif game_board[6] == game_board[7] == game_board[8] != " - ":
        winner = game_board[6]


def check_rows():

    global winner

    if game_board[0] == game_board[3] == game_board[6] != " - ":
        winner = game_board[0]

    elif game_board[1] == game_board[4] == game_board[7] != " - ":
        winner = game_board[1]

    elif game_board[2] == game_board[5] == game_board[8] != " - ":
        winner = game_board[2]


def check_diagonals():

    global winner

    if game_board[0] == game_board[4] == game_board[8] != " - ":
        winner = game_board[0]
    elif game_board[2] == game_board[4] == game_board[6] != " - ":
        winner = game_board[2]


def main():

    global game_still_on, winner

    while game_still_on:
        for player in players:
            print_board()
            print(player + "'s Turn : ")
            player_input(player)

            check_columns()
            check_rows()
            check_diagonals()

            if winner in players:
                print(winner + " Won !")
                exit()

            elif " - " not in game_board:
                print("Tie !")
                exit()


# --------------- End ------------------

# --------------- Call -----------------

if __name__ == "__main__":
    main()

# --------------- End ------------------