tic_tac_toe.py

def display_board(board):

    print(board[1] + ' | ' + board[2] + ' | ' + board[3])
    print('--|---|--')
    print(board[4] + ' | ' + board[5] + ' | ' + board[6])
    print('--|---|--')
    print(board[7] + ' | ' + board[8] + ' | ' + board[9])


def player_input():
    marker = ''
    while marker != 'X' or marker != "O":
        marker = input('Player1 choose X or O: ').upper()
        break
    player1 = marker
    if player1 == 'X':
        player2 = 'O'
    else:
        player2 = 'X'

    return (player1, player2)



def place_marker(board, marker, position):
    board[position] = marker


def win_check(board, mark):
    return ((board[1] == mark and board[2] == mark and board[3] == mark) or
            (board[4] == mark and board[5] == mark and board[6] == mark) or
            (board[7] == mark and board[8] == mark and board[9] == mark) or
            (board[7] == mark and board[5] == mark and board[3] == mark) or
            (board[7] == mark and board[4] == mark and board[1] == mark) or
            (board[1] == mark and board[5] == mark and board[9] == mark) or
            (board[8] == mark and board[5] == mark and board[2] == mark) or
            (board[9] == mark and board[6] == mark and board[3] == mark))


import random


def choose_first():
    if random.randint(0, 1) == 0:
        return 'PLayer1'
    else:
        return 'Player2'


def space_check(board, position):
    return board[position] == ' '


def full_board_check(board):
    for i in range(1, 10):
        if space_check(board, 1):
            return False
        else:
            return True



def player_choice(board):
    position = 0

    while position not in [1,2,3,4,5,6,7,8,9] or not space_check(board, position):
        position = int(input('Choose your next position 1-9'))

    return position


def replay():
    return input('Do you wont to play again Yes or No: ').lower().startswith('y')




print('Welcome to Tic Tac Toe!')

while True:
    # Set the game up here
    theBoard = [' '] * 10
    player1_marker, player2_marker = player_input()
    turn = choose_first()
    print(turn + ' will go first')

    play_game = input('Are you ready to play? Enter Yes or No: ')
    if play_game.lower()[0] == 'y':
        game_on = True
    else:
        game_on = False

    while game_on:
        if turn == 'Player 1':
            display_board(theBoard)
            position = player_choice(theBoard)
            place_marker(theBoard, player1_marker, position)

            if win_check(theBoard, player1_marker):
                display_board(theBoard)
                print('CONGRATULATIONS Player1 WIN the game')
                game_on = False
            else:
                if full_board_check(theBoard):
                    display_board(theBoard)
                    print('The game is a draw')
                    break
                else:
                    turn = 'Player 2'
        else:
            display_board(theBoard)
            position = player_choice(theBoard)
            place_marker(theBoard, player2_marker, position)

            if win_check(theBoard, player2_marker):
                display_board(theBoard)
                print('CONGRATULATIONS Player2 WIN the game')
                game_on = False
            else:
                if full_board_check(theBoard):
                    display_board(theBoard)
                    print('The game is a draw')
                    break
                else:
                    turn = 'Player 1'
    if not replay():
        break