Question

最近，我换了专业并且对计算机科学世界着迷了，我正在努力学习Python。我真的很喜欢它，但是有时候很多人都会卡住。我目前正在上Udemy课程，并尝试着手解决第一个里程碑问题，但是似乎一切都应运而生，但是...结果出错...我所想的还没有完成，但是我想测试一下只是为了确保一切都按计划进行。

我收到以下错误，但仍然给我结果... 如果有人对初学者有任何提示或建议，请多加赞赏！（第一篇文章！不错！：'））

     | | 
     | | 
     | | 
    Player 1 are you X or O? X
    Please Input a Number 1-9: 6
     | | 
     | |O
     | | 
    Traceback (most recent call last):
      File "C:/Users/Danny/Desktop/Python/Python Bootcamp/Milestones/TicTacToe.py", line 76, in <module>
        display(gameon_Board)
      File "C:/Users/Danny/Desktop/Python/Python Bootcamp/Milestones/TicTacToe.py", line 17, in display
        print(board[7]+'|'+board[8]+'|'+board[9])
    TypeError: 'NoneType' object is not subscriptable

以下代码

"""This is a TIC TAC TOE GAME!
    
You need to do the following...

We need to print a board.
Take in player input.
Place their input on the board.
Check if the game is won,tied, lost, or ongoing.
Repeat c and d until the game has been won or tied.
Ask if players want to play again.

Good Luck! """

#Display Board

def display(board):
    print(board[7]+'|'+board[8]+'|'+board[9])
    print(board[4]+'|'+board[5]+'|'+board[6])
    print(board[1]+'|'+board[2]+'|'+board[3])

#Sets up player markers
def player_Marker():
    marker = ' '
    while marker != 'X' and marker != 'O':
        marker = input("Player 1 are you X or O? ")
        
    player1 = marker
    
    if player1 == 'X':
        player2 = 'O'
    else:
        player2 = 'X'
    
    return (player1,player2)

#Takes User Position Input On Board
def player_Choice():
    position = 'wrong'
    while position not in range(1,10):
        position = int(input("Please Input a Number 1-9: "))  
    
    return position

#Tack on Inputs to Board

# CLEAN_Board = ['#',' ',' ',' ',' ',' ',' ',' ',' ',' ']

gameon_Board = ['#',' ',' ',' ',' ',' ',' ',' ',' ',' ']

def boardUP(board,position):
    turn = 1
    if turn == 1:
        gameon_Board[position] = player1_Marker
        turn = turn - 1
    if turn == 0:
        gameon_Board[position] = player2_Marker
        turn += 1

    return display(gameon_Board)


# All Together

game_on = True
gameon_Board = ['#',' ',' ',' ',' ',' ',' ',' ',' ',' ']

while game_on:
    display(gameon_Board)
    
    player1_Marker , player2_Marker = player_Marker()
    
    position = player_Choice()

    gameon_Board = boardUP(gameon_Board,position)

    display(gameon_Board)

Answer 1

display()不返回任何内容，它仅打印电路板。因此，默认返回值为None。

但是boardUP()以return display(gameon_Board)结尾，因此它返回的是None值。

然后使用

将结果分配回变量

gameon_Board = boardUP(gameon_Board,position)

因此，在第一次迭代之后，gameon_Board不再包含板元素列表，而是包含None。然后，当您尝试访问其下标时，会出现错误。

此外，您将木板作为boardUP的参数传递，但它从不使用它。它改为使用全局变量。您应该使用参数。

将功能更改为：

def boardUP(board,position):
    turn = 1
    if turn == 1:
        board[position] = player1_Marker
        turn = turn - 1
    if turn == 0:
        board[position] = player2_Marker
        turn += 1

    display(board)
    return board

学习Python-TypeError：“ NoneType”对象不可下标

1 个答案: