Python代码编写：CSC108H Tic-Tac-Toe

Requirement

​​Tic-tac-toe​​ is a two-player game that children often play to pass the time. The game is usually played using a 3-by-3 game board. Each player chooses a symbol to play with (usually an X or an O) and the goal is to be the first player to place 3 of their symbols in a straight line on the game board (either across a row on the board, down a column or along one of the two main diagonals).

In this Assignment, you are to complete some functions that make up part of a larger program for playing tic-tac-toe. In the program, game boards are not restricted to being 3-by-3, but are instead N-by-N, where N is one of the integers from 1 through 9, inclusive. Our game boards will always be square. When you have completed your functions for this Assignment, you will be able to play games of tic-tac-toe on your computer!

Analysis

Tic-tac-toe又称​​井字棋​​，通常是在3x3的棋盘上，双方轮流落子，先将3枚棋子连成一线的一方获胜。本题将游戏进行了拓展，变为NxN的棋盘，加大了难度。我们需要根据提供的框架实现游戏的逻辑部分，尤其是AI部分。
解题的关键需要理解游戏的规则，读懂整个框架，找到切入点，根据给定的测试集不断调试即可。

Tips

从测试集入手

>>> game_won('XXX-O-O--', 'X')True>>> game_won('XOXOXOOXO', 'X')False
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从__main__开始一路调试，到

def play_tictatoe():  ...  hava_a_winner = game_won(game_board, player_symbol)
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进入函数后，增加处理逻辑，核心代码如下

def game_won(game_board, symbol):  ...  for col in range(1, board_size + 1):    extract = tictactoe_functions.extract_line(game_board, 'dowm', col)      if extract == winning_string:        return True  for row in range(1, board_size + 1):    extract = tictactoe_functions.extract_line(game_board, 'across', row)      if extract == winning_string:        return True  ...  return False
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