Python 井字游戏-Python问题

Python tic tac toe game(Python 井字游戏)

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问题描述

我不确定是否需要所有代码，所以我会发布它:

I am unsure if all of the code will be necessary or not so i will post it:

# Tic-Tac-Toe
# Plays the game of tic-tac-toe against a human opponent

# global constants
X = "X"
O = "O"
EMPTY = " "
TIE = "TIE"
NUM_SQUARES = 9


def display_instruct():
    """Display game instructions."""  
    print(
    """
    Welcome to the greatest intellectual challenge of all time: Tic-Tac-Toe.  
    This will be a showdown between your human brain and my silicon processor.  

    You will make your move known by entering a number, 0 - 8.  The number 
    will correspond to the board position as illustrated:

                    0 | 1 | 2
                    ---------
                    3 | 4 | 5
                    ---------
                    6 | 7 | 8

    Prepare yourself, human.  The ultimate battle is about to begin. 

    """
    )


def ask_yes_no(question):
    """Ask a yes or no question."""
    response = None
    while response not in ("y", "n"):
        response = input(question).lower()
    return response


def ask_number(question, low, high):
    """Ask for a number within a range."""
    response = None
    while response not in range(low, high):
        response = int(input(question))
    return response


def pieces():
    """Determine if player or computer goes first."""
    go_first = ask_yes_no("Do you require the first move? (y/n): ")
    if go_first == "y":
        print("
Then take the first move.  You will need it.")
        human = X
        computer = O
    else:
        print("
Your bravery will be your undoing... I will go first.")
        computer = X
        human = O
    return computer, human


def new_board():
    """Create new game board."""
    board = []
    for square in range(NUM_SQUARES):
        board.append(EMPTY)
    return board



def display_board(board):
    """Display game board on screen."""
    print("
	", board[0], "|", board[1], "|", board[2])
    print("	","---------")
    print("	",board[3], "|", board[4], "|", board[5])
    print("	","---------")
    print("	",board[6], "|", board[7], "|", board[8])

def legal_moves(board):
    """Create list of legal moves."""
    moves = []
    for square in range(NUM_SQUARES):
        if board[square] == EMPTY:
            moves.append(square)
    return moves


def winner(board):
    """Determine the game winner."""
    WAYS_TO_WIN = ((0, 1, 2),
                   (3, 4, 5),
                   (6, 7, 8),
                   (0, 3, 6),
                   (1, 4, 7),
                   (2, 5, 8),
                   (0, 4, 8),
                   (2, 4, 6))

    for row in WAYS_TO_WIN:
        if board[row[0]] == board[row[1]] == board[row[2]] != EMPTY:
            winner = board[row[0]]
            return winner

    if EMPTY not in board:
        return TIE

    return None


def human_move(board, human):
    """Get human move."""  
    legal = legal_moves(board)
    move = None
    while move not in legal:
        move = ask_number("Where will you move? (0 - 8):", 0, NUM_SQUARES)
        if move not in legal:
            print("
That square is already occupied, foolish human.  Choose another.
")
    print("Fine...")
    return move


def computer_move(board, computer, human):
    """Make computer move."""
    # make a copy to work with since function will be changing list
    board = board[:]
    # the best positions to have, in order
    BEST_MOVES = (4, 0, 2, 6, 8, 1, 3, 5, 7)

    print("I shall take square number,", end="")

    # if computer can win, take that move
    for move in legal_moves(board):
        board[move] = computer
        if winner(board) == computer:
            print(move)
            return move
        # done checking this move, undo it
        board[move] = EMPTY

    # if human can win, block that move
    for move in legal_moves(board):
        board[move] = human
        if winner(board) == human:
            print(move)
            return move
        # done checkin this move, undo it
        board[move] = EMPTY

    # since no one can win on next move, pick best open square
    for move in BEST_MOVES:
        if move in legal_moves(board):
            print(move)
            return move


def next_turn(turn):
    """Switch turns."""
    if turn == X:
        return O
    else:
        return X


def congrat_winner(the_winner, computer, human):
    """Congratulate the winner."""
    if the_winner != TIE:
        print(the_winner, "won!
")
    else:
        print("It's a tie!
")

    if the_winner == computer:
        print("As I predicted, human, I am triumphant once more.  
" 
              "Proof that computers are superior to humans in all regards.")

    elif the_winner == human:
        print("No, no!  It cannot be!  Somehow you tricked me, human. 
" 
              "But never again!  I, the computer, so swear it!")

    elif the_winner == TIE:
        print("You were most lucky, human, and somehow managed to tie me.  
" 
              "Celebrate today... for this is the best you will ever achieve.")


def main():
    display_instruct()
    computer, human = pieces()
    turn = X
    board = new_board()
    display_board(board)

    while not winner(board):
        if turn == human:
            move = human_move(board, human)
            board[move] = human
        else:
            move = computer_move(board, computer, human)
            board[move] = computer
        display_board(board)
        turn = next_turn(turn)

    the_winner = winner(board)
    congrat_winner(the_winner, computer, human)


# start the program
main()
input("

Press the enter key to quit.")

这是我正在阅读的书中的一个例子，我还没有完全理解，我认为直到:

This is an example in a book i am reading and i am not fully understanding, i think understand all of it up until:

for row in WAYS_TO_WIN:
            if board[row[0]] == board[row[1]] == board[row[2]] != EMPTY:
                winner = board[row[0]]
                return winner

谁能解释一下这个函数的作用，更具体地说是什么条件if board[row[0]] == board[row[1]] == board[row[2]] != EMPTY: 正在测试?

Can somebody please explain what this function does and more specifically what the condition if board[row[0]] == board[row[1]] == board[row[2]] != EMPTY: is testing?

问题描述

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