Question

所以我是python的总菜鸟，所以我很抱歉，如果我不够具体。

我正在写一个tic tac toe程序，最困难的是转换

所以我写了一个函数来做这个，但我不能得到属于另一个函数的“转”变量。对不起，如果我是傻瓜，但这是我能解释的最好的。谢谢您的时间：）

BTW这里是代码

x="X"
o="O"
EMPTY=" "
TIE="TIE"
NUM_SQUARES=9

def display_instruct():
    print(
    """
    Welcome to the greatest challenge ever

    Tic
    Tac 
    Toe

    the board is as shown

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


    Prepare as teh game is about to start
    """)

def yesno(question):
    response=None
    while response not in ("y","n"):
        response=input(question).lower()
    return response
def asknum(question, low, high):
    response=None
    while response not in range(low,high):
        response=int(input(question))
    return response

def pieces():
    go_first=yesno("Do you want the first move")

    if go_first=="y":
        print("then take the first move you will need it")
        human=x
        computer=o
        turn=x
        return computer, human
    else:
        print ("Ok i shall go first")
        computer=x
        human=o
        turn=x
        return computer, human



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

def display_board(board):
    print ("\n")
    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):
    moves=[]
    for square in range(NUM_SQUARES):
        if board[square]==EMPTY:
            moves.append(square)
    return moves

def winner(board):
    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=[row[0]]
            return winner
        if EMPTY not in board:
            return TIE
        return None



def human_move(board,human):
    legal=legal_moves(board)
    move=None
    print (legal)
    while move not in legal:
        move=asknum("Where will you move",0,NUM_SQUARES)
    return move

def computer_move(board,computer,human):
    board=board[:]
    BEST_MOVES=(4,0,2,6,8,1,3,5,7)
    print ("I shall take square number", end=" ")
    for move in legal_moves(board):
        board[move]=computer
        if winner(board)==computer:
            print(move)
            return move
    for move in legal_moves(board):
        board[move]=human
        if winner(board)==human:
            print(move)
        return move

    board[move]=EMPTY

    for move in BEST_MOVES:
        if move in legal_moves(board):
            print (move)
        return move

def next_turn(turn):
    if turn==x:
        return o
    else:
        return x
def congrat_winner(the_winner,computer,human):
    if the_winner!=TIE:
        print(the_winner, "WON")
    else:
        print ("Its a ttie")
    if the_winner==computer:
        print ("I WON HA HA IN YO FACE")
    elif the_winner==human:
        print ("NO IT CANNOT BE")
    elif the_winner==TIE:
        print ("you were lucky this time")
def curturn(turn,computer,human):

    if turn==x and move!="" and move!=" ":
        turn=o
    elif turn==o and move!="" and move!=" ":
        turn=x


def main():
    display_instruct()

    computer, human=pieces()
    turn=x
    board=new_board()
    display_board(board)
    curturn(turn,computer,human)
    while not winner (board):
        display_board(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)




main()

Answer 1

函数看起来像这样（简化）：

def functionname(parameter1, parameter2=foo):
    code that does stuff
    return value

如果您的函数中想要从调用函数访问变量，则将其作为参数传递。如果您从调用函数想要从您调用的函数中访问变量，则返回它。

你也可以使用全局变量（你看到了），这是一个坏主意，因为它会使你的程序变得混乱而且难以调试。如果可以的话，请避免这种情况（虽然在这样的小程序中，这不是灾难，所以现在不要打扰。）

如果你想从完全不同的地方访问变量，你可能想要研究面向对象的编程，包括类和东西。

我如何从函数中获取变量？

1 个答案: