xoxo.py

from os import system
from random import randint

def display_board(board):
    system('clear')

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

def player_input():
    marker = ''

    while not (marker == 'X' or marker == 'O'):
        marker = input('Player 1: Do you want to be X or O: ').upper()

    if marker == 'X':
        return ('X', 'O')
    else:
        return ('O', 'X')

def choose_first():
    return 'Player 1' if randint(0,1) == 0 else 'Player 2'
    

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

def replay():
    return input('Do you want to play again? Enter Yes or No: ').upper().startswith('Y')

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

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

def player_choice(board, turn):
    position = 0
    
    while position not in [1,2,3,4,5,6,7,8,9] or not space_check(board, position):
        position = int(input(turn + ',Choose your next position: (1-9) '))
        
    return position

def win_check(board,mark):
    
    return ((board[7] == mark and board[8] == mark and board[9] == mark) or # across the top
    (board[4] == mark and board[5] == mark and board[6] == mark) or # across the middle
    (board[1] == mark and board[2] == mark and board[3] == mark) or # across the bottom
    (board[7] == mark and board[4] == mark and board[1] == mark) or # down the middle
    (board[8] == mark and board[5] == mark and board[2] == mark) or # down the middle
    (board[9] == mark and board[6] == mark and board[3] == mark) or # down the right side
    (board[7] == mark and board[5] == mark and board[3] == mark) or # diagonal
    (board[9] == mark and board[5] == mark and board[1] == mark)) # diagonal

print("Welcome to Tic Tac Toe!")
while True:
    theBoard = [' '] * 10 # theBoard = [' ', ' ', ' '] 10 fois
    player1, player2 = player_input()
    print('Player1 choosed '+ player1 + ', Player 2 choosed '+player2)
    turn = choose_first()
    print(turn + ' will play first!')

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

    while play_game:
        if turn == 'Player 1':
            # Player1's turn
            display_board(theBoard)
            position = player_choice(theBoard, turn)
            place_marker(theBoard, player1, position)

            if win_check(theBoard, player1):
                display_board(theBoard)
                print('Congratulations! Player1 has won the game!')
                play_game = False
            else:
                if full_board_check(theBoard):
                    display_board(theBoard)
                    print('It\'s a draw!')
                    break
                else:
                    turn = 'Player 2'
        else:
            # Player's2 turn
            display_board(theBoard)
            position = player_choice(theBoard, turn)
            place_marker(theBoard, player2, position)

            if win_check(theBoard, player2):
                display_board(theBoard)
                print('Congratulations! Player2 has won the game!')
                play_game = False
            else:
                if full_board_check(theBoard):
                    display_board(theBoard)
                    print('It\'s a draw!')
                    break
                else:
                    turn = 'Player 1'

    if not replay():
        break