选择位置函数在Tac脚趾游戏中不起作用

Question

我使用python制作了一个that游戏，所以我在choose_position()函数中遇到了问题，它可以根据玩家选择的数字(1比9)设置行和插槽，但是行和槽总是0，所以它总是第一个列表中的第一个组件，不会改变，我也不知道为什么。

下面是用户选择5(所以行应该等于1，槽等于2)但仍然行和槽都是0的例子：

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from tabnanny import check


board = [["-","-","-"],["-","-","-"],["-","-","-"]]
def print_board(board):
    for  row in board:
        for slot in row:
            print(f"{slot}",end=" ")
        print()

def current_user(user):
    if user: return "x"
    else:return "o"

def choose_position(choice,row,slot):
    print("this is choice:",choice,type(choice))#just checking the choice value and type
    if choice in [1,2,3]:
        row = 0
        slot = choice-1
    elif choice in [4,5,6]:
        row = 1
        slot = choice-4
    elif choice in [7,8,9]:
        row = 2
        slot = choice -7

def limit(choice):
    if int(choice)>9 or int(choice)<1:
        print("please enter a number between 1 and 9 if you would be so good")
        return True
    else: return False

def isnum(choice):
    if not choice.isnumeric():
        print("Please enter a valid number if you would be so good")
        return True
    else: return False

def check_input(choice):
    if isnum(choice): return True
    if limit(choice): return True
    return False

def quit(choice):
    if choice == "q": return True
    else: return False

user = True #x means true,false means o
turns = 0
row = 0
slot = 0
while turns < 9:
    print(turns)

    print_board(board)
    active_user = current_user(user)
    choice = input("enter a position between 1 and 9:\n")
    if quit(choice):break

    if check_input(choice):
        print("oups wrong")
        continue
    choose_position(int(choice),row,slot)
    print(row,slot)#just checking row and slot values

    board[row][slot] = active_user

    turns+=1
    user = not user

Answer 1

您的问题是，您通过值传递变量。这意味着如果调用choose_position(int(choice),row,slot)，python将生成row和slot值的本地副本(仅在choose_position()中有效)。在函数期间，只有这些局部变量在返回时被更改和丢弃。具有相同名称的“外部”变量将永远不会更改。

您应该研究“”和关键字"ref“。或者，您可以将这些值返回为list (甚至更好的是元组)，并将它们分配给传入的值。如下所示：

(row, slot) = choose_position(int(choice))

在你的功能中，你会写：

return (row, slot)