python井字棋游戏代码

以下是一个简单的Python井字棋游戏代码：

import random

board = [' ' for x in range(10)]


def insert_letter(letter, pos):
    board[pos] = letter


def space_is_free(pos):
    return board[pos] == ' '


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


def is_winner(bo, le):
    return (bo[7] == le and bo[8] == le and bo[9] == le) or \
           (bo[4] == le and bo[5] == le and bo[6] == le) or \
           (bo[1] == le and bo[2] == le and bo[3] == le) or \
           (bo[7] == le and bo[4] == le and bo[1] == le) or \
           (bo[8] == le and bo[5] == le and bo[2] == le) or \
           (bo[9] == le and bo[6] == le and bo[3] == le) or \
           (bo[7] == le and bo[5] == le and bo[3] == le) or \
           (bo[9] == le and bo[5] == le and bo[1] == le)


def player_move():
    run = True
    while run:
        move = input("Please select a position to place an 'X' (1-9): ")
        try:
            move = int(move)
            if move > 0 and move < 10:
                if space_is_free(move):
                    run = False
                    insert_letter('X', move)
                else:
                    print("Sorry, this space is occupied!")
            else:
                print("Please type a number within the range!")
        except:
            print("Please type a number!")


def computer_move():
    possible_moves = [x for x, letter in enumerate(board) if letter == ' ' and x != 0]
    move = 0

    for let in ['O', 'X']:
        for i in possible_moves:
            board_copy = board[:]
            board_copy[i] = let
            if is_winner(board_copy, let):
                move = i
                return move

    corners_open = []
    for i in possible_moves:
        if i in [1, 3, 7, 9]:
            corners_open.append(i)

    if len(corners_open) > 0:
        move = select_random(corners_open)
        return move

    if 5 in possible_moves:
        move = 5
        return move

    edges_open = []
    for i in possible_moves:
        if i in [2, 4, 6, 8]:
            edges_open.append(i)

    if len(edges_open) > 0:
        move = select_random(edges_open)

    return move


def select_random(li):
    ln = len(li)
    r = random.randrange(0, ln)
    return li[r]


def is_board_full(board):
    if board.count(' ') > 1:
        return False
    else:
        return True


def main():
    print("Welcome to Tic Tac Toe!")
    print_board(board)

    while not is_board_full(board):
        if not is_winner(board, 'O'):
            player_move()
            print_board(board)
        else:
            print("Sorry, O's won this time!")
            break

        if not is_winner(board, 'X'):
            mo_