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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又稱井字棋，通常是在3x3的棋盤上，雙方輪流落子，先將3枚棋子連成一線的一方獲勝。本題將游戲進行了拓展，變?yōu)镹xN的棋盤，加大了難度。我們需要根據(jù)提供的框架實現(xiàn)游戲的邏輯部分，尤其是AI部分。
解題的關(guān)鍵需要理解游戲的規(guī)則，讀懂整個框架，找到切入點，根據(jù)給定的測試集不斷調(diào)試即可。

Tips

從測試集入手

>>> game_won('XXX-O-O--', 'X')True>>> game_won('XOXOXOOXO', 'X')False 復制代碼

從__main__開始一路調(diào)試，到

def play_tictatoe(): ?... ?hava_a_winner = game_won(game_board, player_symbol) 復制代碼

進入函數(shù)后，增加處理邏輯，核心代碼如下

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 復制代碼